31423724 has 6 divisors (see below), whose sum is σ = 54991524. Its totient is φ = 15711860.

The previous prime is 31423709. The next prime is 31423729. The reversal of 31423724 is 42732413.

It is a junction number, because it is equal to n+sod(n) for n = 31423693 and 31423702.

It is not an unprimeable number, because it can be changed into a prime (31423729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3927962 + ... + 3927969.

It is an arithmetic number, because the mean of its divisors is an integer number (9165254).

Almost surely, 2^31423724 is an apocalyptic number.

It is an amenable number.

31423724 is a deficient number, since it is larger than the sum of its proper divisors (23567800).

31423724 is a wasteful number, since it uses less digits than its factorization.

31423724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7855935 (or 7855933 counting only the distinct ones).

The product of its digits is 4032, while the sum is 26.

The square root of 31423724 is about 5605.6867554297. The cubic root of 31423724 is about 315.5628602826.

The spelling of 31423724 in words is "thirty-one million, four hundred twenty-three thousand, seven hundred twenty-four".