31423856 has 20 divisors (see below), whose sum is σ = 60970800. Its totient is φ = 15689472.

The previous prime is 31423823. The next prime is 31423877. The reversal of 31423856 is 65832413.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20360 + ... + 21848.

It is an arithmetic number, because the mean of its divisors is an integer number (3048540).

Almost surely, 2^31423856 is an apocalyptic number.

It is an amenable number.

31423856 is a deficient number, since it is larger than the sum of its proper divisors (29546944).

31423856 is a wasteful number, since it uses less digits than its factorization.

31423856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816 (or 2810 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 31423856 is about 5605.6985291755. The cubic root of 31423856 is about 315.5633021381.

The spelling of 31423856 in words is "thirty-one million, four hundred twenty-three thousand, eight hundred fifty-six".