31089140 has 24 divisors (see below), whose sum is σ = 65709672. Its totient is φ = 12355200.

The previous prime is 31089119. The next prime is 31089143. The reversal of 31089140 is 4198013.

It can be written as a sum of positive squares in 4 ways, for example, as 7333264 + 23755876 = 2708^2 + 4874^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31089143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1811 + ... + 8090.

It is an arithmetic number, because the mean of its divisors is an integer number (2737903).

Almost surely, 2^31089140 is an apocalyptic number.

It is an amenable number.

31089140 is an abundant number, since it is smaller than the sum of its proper divisors (34620532).

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

31089140 is a wasteful number, since it uses less digits than its factorization.

31089140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10067 (or 10065 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31089140 is about 5575.7636248320. The cubic root of 31089140 is about 314.4388767435.

The spelling of 31089140 in words is "thirty-one million, eighty-nine thousand, one hundred forty".