31795140 has 48 divisors (see below), whose sum is σ = 95876928. Its totient is φ = 7826304.

The previous prime is 31795123. The next prime is 31795147. The reversal of 31795140 is 4159713.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31795098 and 31795107.

It is not an unprimeable number, because it can be changed into a prime (31795147) 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 15 ways as a sum of consecutive naturals, for example, 19602 + ... + 21161.

It is an arithmetic number, because the mean of its divisors is an integer number (1997436).

Almost surely, 2^31795140 is an apocalyptic number.

31795140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31795140 is an abundant number, since it is smaller than the sum of its proper divisors (64081788).

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

31795140 is a wasteful number, since it uses less digits than its factorization.

31795140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40788 (or 40786 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 31795140 is about 5638.7179393901. The cubic root of 31795140 is about 316.8012699546.

The spelling of 31795140 in words is "thirty-one million, seven hundred ninety-five thousand, one hundred forty".