31140140 has 12 divisors (see below), whose sum is σ = 65394336. Its totient is φ = 12456048.

The previous prime is 31140077. The next prime is 31140157. The reversal of 31140140 is 4104113.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 778484 + ... + 778523.

It is an arithmetic number, because the mean of its divisors is an integer number (5449528).

Almost surely, 2^31140140 is an apocalyptic number.

It is an amenable number.

31140140 is an abundant number, since it is smaller than the sum of its proper divisors (34254196).

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

31140140 is a wasteful number, since it uses less digits than its factorization.

31140140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557016 (or 1557014 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 31140140 is about 5580.3351153851. The cubic root of 31140140 is about 314.6107226225.

Adding to 31140140 its reverse (4104113), we get a palindrome (35244253).

It can be divided in two parts, 3 and 1140140, that multiplied together give a triangular number (3420420 = T₂₆₁₅).

The spelling of 31140140 in words is "thirty-one million, one hundred forty thousand, one hundred forty".