31380032 has 14 divisors (see below), whose sum is σ = 62269878. Its totient is φ = 15689984.

The previous prime is 31380031. The next prime is 31380101. The reversal of 31380032 is 23008313.

It can be written as a sum of positive squares in only one way, i.e., 30647296 + 732736 = 5536^2 + 856^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31379986 and 31380013.

It is not an unprimeable number, because it can be changed into a prime (31380031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245093 + ... + 245220.

Almost surely, 2^31380032 is an apocalyptic number.

31380032 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31380032 is a deficient number, since it is larger than the sum of its proper divisors (30889846).

31380032 is an equidigital number, since it uses as much as digits as its factorization.

31380032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490325 (or 490315 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31380032 is about 5601.7882858959. The cubic root of 31380032 is about 315.4165380583.

Adding to 31380032 its reverse (23008313), we get a palindrome (54388345).

The spelling of 31380032 in words is "thirty-one million, three hundred eighty thousand, thirty-two".