31230140 has 24 divisors (see below), whose sum is σ = 65703120. Its totient is φ = 12469248.

The previous prime is 31230079. The next prime is 31230163. The reversal of 31230140 is 4103213.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13724 + ... + 15836.

It is an arithmetic number, because the mean of its divisors is an integer number (2737630).

Almost surely, 2^31230140 is an apocalyptic number.

It is an amenable number.

31230140 is an abundant number, since it is smaller than the sum of its proper divisors (34472980).

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

31230140 is a wasteful number, since it uses less digits than its factorization.

31230140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861 (or 2859 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31230140 is about 5588.3933290347. The cubic root of 31230140 is about 314.9135229148.

Adding to 31230140 its reverse (4103213), we get a palindrome (35333353).

The spelling of 31230140 in words is "thirty-one million, two hundred thirty thousand, one hundred forty".