31232140 has 12 divisors (see below), whose sum is σ = 65587536. Its totient is φ = 12492848.

The previous prime is 31232087. The next prime is 31232141. The reversal of 31232140 is 4123213.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31232141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780784 + ... + 780823.

It is an arithmetic number, because the mean of its divisors is an integer number (5465628).

Almost surely, 2^31232140 is an apocalyptic number.

It is an amenable number.

31232140 is an abundant number, since it is smaller than the sum of its proper divisors (34355396).

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

31232140 is a wasteful number, since it uses less digits than its factorization.

31232140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561616 (or 1561614 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31232140 is about 5588.5722684779. The cubic root of 31232140 is about 314.9202451987.

Adding to 31232140 its reverse (4123213), we get a palindrome (35355353).

The spelling of 31232140 in words is "thirty-one million, two hundred thirty-two thousand, one hundred forty".