31450540 has 48 divisors (see below), whose sum is σ = 73301760. Its totient is φ = 11238080.

The previous prime is 31450487. The next prime is 31450541. The reversal of 31450540 is 4505413.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (31450541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11769 + ... + 14191.

It is an arithmetic number, because the mean of its divisors is an integer number (1527120).

Almost surely, 2^31450540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31450540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36650880).

31450540 is an abundant number, since it is smaller than the sum of its proper divisors (41851220).

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

31450540 is a wasteful number, since it uses less digits than its factorization.

31450540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502 (or 2500 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 31450540 is about 5608.0781021666. The cubic root of 31450540 is about 315.6525985082.

Adding to 31450540 its reverse (4505413), we get a palindrome (35955953).

The spelling of 31450540 in words is "thirty-one million, four hundred fifty thousand, five hundred forty".