31861842 has 16 divisors (see below), whose sum is σ = 67472352. Its totient is φ = 9995840.

The previous prime is 31861813. The next prime is 31861849. The reversal of 31861842 is 24816813.

It is not an unprimeable number, because it can be changed into a prime (31861849) 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, 156084 + ... + 156287.

It is an arithmetic number, because the mean of its divisors is an integer number (4217022).

Almost surely, 2^31861842 is an apocalyptic number.

31861842 is an abundant number, since it is smaller than the sum of its proper divisors (35610510).

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

31861842 is a wasteful number, since it uses less digits than its factorization.

31861842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312393.

The product of its digits is 9216, while the sum is 33.

The square root of 31861842 is about 5644.6294829687. The cubic root of 31861842 is about 317.0226509438.

The spelling of 31861842 in words is "thirty-one million, eight hundred sixty-one thousand, eight hundred forty-two".