31307423 has 12 divisors (see below), whose sum is σ = 36525600. Its totient is φ = 26756352.

The previous prime is 31307413. The next prime is 31307447. The reversal of 31307423 is 32470313.

It is a happy number.

It is not a de Polignac number, because 31307423 - 2⁴ = 31307407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31307413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21290 + ... + 22712.

It is an arithmetic number, because the mean of its divisors is an integer number (3043800).

Almost surely, 2^31307423 is an apocalyptic number.

31307423 is a deficient number, since it is larger than the sum of its proper divisors (5218177).

31307423 is a wasteful number, since it uses less digits than its factorization.

31307423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886 (or 1879 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 31307423 is about 5595.3036557456. The cubic root of 31307423 is about 315.1730736133.

Adding to 31307423 its reverse (32470313), we get a palindrome (63777736).

The spelling of 31307423 in words is "thirty-one million, three hundred seven thousand, four hundred twenty-three".