31423256 has 8 divisors (see below), whose sum is σ = 58918620. Its totient is φ = 15711624.

The previous prime is 31423253. The next prime is 31423291. The reversal of 31423256 is 65232413.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1963946 + ... + 1963961.

Almost surely, 2^31423256 is an apocalyptic number.

It is an amenable number.

31423256 is a deficient number, since it is larger than the sum of its proper divisors (27495364).

31423256 is a wasteful number, since it uses less digits than its factorization.

31423256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927913 (or 3927909 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 31423256 is about 5605.6450119500. The cubic root of 31423256 is about 315.5612936939.

Adding to 31423256 its reverse (65232413), we get a palindrome (96655669).

The spelling of 31423256 in words is "thirty-one million, four hundred twenty-three thousand, two hundred fifty-six".