31401856 has 32 divisors (see below), whose sum is σ = 66242880. Its totient is φ = 14776320.

The previous prime is 31401833. The next prime is 31401869. The reversal of 31401856 is 65810413.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

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, 5040 + ... + 9391.

It is an arithmetic number, because the mean of its divisors is an integer number (2070090).

Almost surely, 2^31401856 is an apocalyptic number.

It is an amenable number.

31401856 is an abundant number, since it is smaller than the sum of its proper divisors (34841024).

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

31401856 is a wasteful number, since it uses less digits than its factorization.

31401856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14462 (or 14450 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 31401856 is about 5603.7358967032. The cubic root of 31401856 is about 315.4896424594.

It can be divided in two parts, 31 and 401856, that multiplied together give a triangular number (12457536 = T₄₉₉₁).

The spelling of 31401856 in words is "thirty-one million, four hundred one thousand, eight hundred fifty-six".