31442432 has 80 divisors (see below), whose sum is σ = 74376192. Its totient is φ = 12994560.

The previous prime is 31442431. The next prime is 31442441. The reversal of 31442432 is 23424413.

It is a junction number, because it is equal to n+sod(n) for n = 31442398 and 31442407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442431) 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, 110963 + ... + 111245.

Almost surely, 2^31442432 is an apocalyptic number.

31442432 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 31442432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37188096).

31442432 is an abundant number, since it is smaller than the sum of its proper divisors (42933760).

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

31442432 is an equidigital number, since it uses as much as digits as its factorization.

31442432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 323 counting only the distinct ones).

The product of its digits is 2304, while the sum is 23.

The square root of 31442432 is about 5607.3551697748. The cubic root of 31442432 is about 315.6254709270.

Adding to 31442432 its reverse (23424413), we get a palindrome (54866845).

The spelling of 31442432 in words is "thirty-one million, four hundred forty-two thousand, four hundred thirty-two".