31425432 has 64 divisors (see below), whose sum is σ = 82663680. Its totient is φ = 9942912.

The previous prime is 31425397. The next prime is 31425461. The reversal of 31425432 is 23452413.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37773 + ... + 38595.

It is an arithmetic number, because the mean of its divisors is an integer number (1291620).

Almost surely, 2^31425432 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 31425432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41331840).

31425432 is an abundant number, since it is smaller than the sum of its proper divisors (51238248).

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

31425432 is a wasteful number, since it uses less digits than its factorization.

31425432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 908 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 31425432 is about 5605.8390986542. The cubic root of 31425432 is about 315.5685775299.

Adding to 31425432 its reverse (23452413), we get a palindrome (54877845).

The spelling of 31425432 in words is "thirty-one million, four hundred twenty-five thousand, four hundred thirty-two".