31240032 has 48 divisors (see below), whose sum is σ = 84015792. Its totient is φ = 10158080.

The previous prime is 31240031. The next prime is 31240043. The reversal of 31240032 is 23004213.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×31240032² = 1951879198722048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31239993 and 31240020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33 + ... + 7904.

It is an arithmetic number, because the mean of its divisors is an integer number (1750329).

Almost surely, 2^31240032 is an apocalyptic number.

31240032 is a gapful number since it is divisible by the number (32) 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 31240032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42007896).

31240032 is an abundant number, since it is smaller than the sum of its proper divisors (52775760).

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

31240032 is a wasteful number, since it uses less digits than its factorization.

31240032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7991 (or 7983 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 31240032 is about 5589.2783076172. The cubic root of 31240032 is about 314.9467685308.

Adding to 31240032 its reverse (23004213), we get a palindrome (54244245).

The spelling of 31240032 in words is "thirty-one million, two hundred forty thousand, thirty-two".