31000140 has 36 divisors (see below), whose sum is σ = 94034304. Its totient is φ = 8266656.

The previous prime is 31000127. The next prime is 31000157. The reversal of 31000140 is 4100013.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31000140² = 1922017360039200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 85932 + ... + 86291.

It is an arithmetic number, because the mean of its divisors is an integer number (2612064).

Almost surely, 2^31000140 is an apocalyptic number.

31000140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31000140 is an abundant number, since it is smaller than the sum of its proper divisors (63034164).

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

31000140 is a wasteful number, since it uses less digits than its factorization.

31000140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172238 (or 172233 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 31000140 is about 5567.7769351870. The cubic root of 31000140 is about 314.1385381344.

Adding to 31000140 its reverse (4100013), we get a palindrome (35100153).

The spelling of 31000140 in words is "thirty-one million, one hundred forty", and thus it is an aban number.