31869036 has 18 divisors (see below), whose sum is σ = 80557932. Its totient is φ = 10623000.

The previous prime is 31869017. The next prime is 31869037. The reversal of 31869036 is 63096813.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 885251 = 31869036 / (3 + 1 + 8 + 6 + 9 + 0 + 3 + 6).

It is not an unprimeable number, because it can be changed into a prime (31869037) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 442590 + ... + 442661.

Almost surely, 2^31869036 is an apocalyptic number.

31869036 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31869036 is an abundant number, since it is smaller than the sum of its proper divisors (48688896).

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

31869036 is a wasteful number, since it uses less digits than its factorization.

31869036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885261 (or 885256 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 31869036 is about 5645.2666898916. The cubic root of 31869036 is about 317.0465090468.

The spelling of 31869036 in words is "thirty-one million, eight hundred sixty-nine thousand, thirty-six".