31433040 has 120 divisors (see below), whose sum is σ = 106633800. Its totient is φ = 8297472.

The previous prime is 31433033. The next prime is 31433047. The reversal of 31433040 is 4033413.

It is an interprime number because it is at equal distance from previous prime (31433033) and next prime (31433047).

It can be written as a sum of positive squares in 4 ways, for example, as 4309776 + 27123264 = 2076^2 + 5208^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31433047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107134 + ... + 107426.

It is an arithmetic number, because the mean of its divisors is an integer number (888615).

Almost surely, 2^31433040 is an apocalyptic number.

31433040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31433040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53316900).

31433040 is an abundant number, since it is smaller than the sum of its proper divisors (75200760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31433040 is a wasteful number, since it uses less digits than its factorization.

31433040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 31433040 is about 5606.5176357522. The cubic root of 31433040 is about 315.5940415343.

Adding to 31433040 its reverse (4033413), we get a palindrome (35466453).

The spelling of 31433040 in words is "thirty-one million, four hundred thirty-three thousand, forty".