31869643 has 12 divisors (see below), whose sum is σ = 35477904. Its totient is φ = 28458000.

The previous prime is 31869623. The next prime is 31869653. The reversal of 31869643 is 34696813.

It is a de Polignac number, because none of the positive numbers 2^k-31869643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31869596 and 31869605.

It is not an unprimeable number, because it can be changed into a prime (31869613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11218 + ... + 13768.

It is an arithmetic number, because the mean of its divisors is an integer number (2956492).

Almost surely, 2^31869643 is an apocalyptic number.

31869643 is a deficient number, since it is larger than the sum of its proper divisors (3608261).

31869643 is a wasteful number, since it uses less digits than its factorization.

31869643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626 (or 2595 counting only the distinct ones).

The product of its digits is 93312, while the sum is 40.

The square root of 31869643 is about 5645.3204514890. The cubic root of 31869643 is about 317.0485219307.

The spelling of 31869643 in words is "thirty-one million, eight hundred sixty-nine thousand, six hundred forty-three".