31920842 has 8 divisors (see below), whose sum is σ = 47928576. Its totient is φ = 15944652.

The previous prime is 31920841. The next prime is 31920859. The reversal of 31920842 is 24802913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31920841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5168 + ... + 9515.

It is an arithmetic number, because the mean of its divisors is an integer number (5991072).

Almost surely, 2^31920842 is an apocalyptic number.

31920842 is a deficient number, since it is larger than the sum of its proper divisors (16007734).

31920842 is a wasteful number, since it uses less digits than its factorization.

31920842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15772.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 31920842 is about 5649.8532724311. The cubic root of 31920842 is about 317.2182119647.

The spelling of 31920842 in words is "thirty-one million, nine hundred twenty thousand, eight hundred forty-two".