31872230 has 16 divisors (see below), whose sum is σ = 61783344. Its totient is φ = 11768160.

The previous prime is 31872223. The next prime is 31872241. The reversal of 31872230 is 3227813.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 31872230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122456 + ... + 122715.

It is an arithmetic number, because the mean of its divisors is an integer number (3861459).

Almost surely, 2^31872230 is an apocalyptic number.

31872230 is a deficient number, since it is larger than the sum of its proper divisors (29911114).

31872230 is a wasteful number, since it uses less digits than its factorization.

31872230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245191.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 31872230 is about 5645.5495746650. The cubic root of 31872230 is about 317.0571004426.

The spelling of 31872230 in words is "thirty-one million, eight hundred seventy-two thousand, two hundred thirty".