31423232 has 36 divisors (see below), whose sum is σ = 63269976. Its totient is φ = 15575040.

The previous prime is 31423187. The next prime is 31423237. The reversal of 31423232 is 23232413.

It is not an unprimeable number, because it can be changed into a prime (31423237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33068 + ... + 34004.

Almost surely, 2^31423232 is an apocalyptic number.

31423232 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 31423232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31634988).

31423232 is an abundant number, since it is smaller than the sum of its proper divisors (31846744).

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

31423232 is an equidigital number, since it uses as much as digits as its factorization.

31423232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084 (or 1070 counting only the distinct ones).

The product of its digits is 864, while the sum is 20.

The square root of 31423232 is about 5605.6428712504. The cubic root of 31423232 is about 315.5612133556.

Adding to 31423232 its reverse (23232413), we get a palindrome (54655645).

The spelling of 31423232 in words is "thirty-one million, four hundred twenty-three thousand, two hundred thirty-two".