31500140 has 36 divisors (see below), whose sum is σ = 76952736. Its totient is φ = 10799712.

The previous prime is 31500113. The next prime is 31500149. The reversal of 31500140 is 4100513.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (31500149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15092 + ... + 17051.

It is an arithmetic number, because the mean of its divisors is an integer number (2137576).

Almost surely, 2^31500140 is an apocalyptic number.

It is an amenable number.

31500140 is an abundant number, since it is smaller than the sum of its proper divisors (45452596).

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

31500140 is a wasteful number, since it uses less digits than its factorization.

31500140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32166 (or 32157 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 31500140 is about 5612.4985523383. The cubic root of 31500140 is about 315.8184477606.

Adding to 31500140 its reverse (4100513), we get a palindrome (35600653).

It can be divided in two parts, 31500 and 140, that multiplied together give a square (4410000 = 2100²).

The spelling of 31500140 in words is "thirty-one million, five hundred thousand, one hundred forty".