31864842 has 36 divisors (see below), whose sum is σ = 70147350. Its totient is φ = 10453536.

The previous prime is 31864829. The next prime is 31864853. The reversal of 31864842 is 24846813.

31864842 is a `hidden beast` number, since 3 + 1 + 8 + 648 + 4 + 2 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 26842761 + 5022081 = 5181^2 + 2241^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31864797 and 31864806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 213784 + ... + 213932.

Almost surely, 2^31864842 is an apocalyptic number.

31864842 is an abundant number, since it is smaller than the sum of its proper divisors (38282508).

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

31864842 is a wasteful number, since it uses less digits than its factorization.

31864842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 263 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 31864842 is about 5644.8952160337. The cubic root of 31864842 is about 317.0326005475.

The spelling of 31864842 in words is "thirty-one million, eight hundred sixty-four thousand, eight hundred forty-two".