31440832 has 28 divisors (see below), whose sum is σ = 62976760. Its totient is φ = 15572736.

The previous prime is 31440823. The next prime is 31440833. The reversal of 31440832 is 23804413.

It is a junction number, because it is equal to n+sod(n) for n = 31440797 and 31440806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440833) 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 3 ways as a sum of consecutive naturals, for example, 4723 + ... + 9229.

It is an arithmetic number, because the mean of its divisors is an integer number (2249170).

Almost surely, 2^31440832 is an apocalyptic number.

31440832 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 31440832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31488380).

31440832 is an abundant number, since it is smaller than the sum of its proper divisors (31535928).

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

31440832 is a wasteful number, since it uses less digits than its factorization.

31440832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628 (or 4618 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 31440832 is about 5607.2124982026. The cubic root of 31440832 is about 315.6201171287.

The spelling of 31440832 in words is "thirty-one million, four hundred forty thousand, eight hundred thirty-two".