31247942 has 16 divisors (see below), whose sum is σ = 51836112. Its totient is φ = 14008320.

The previous prime is 31247927. The next prime is 31247947. The reversal of 31247942 is 24974213.

It is a junction number, because it is equal to n+sod(n) for n = 31247899 and 31247908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31247947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8123 + ... + 11334.

It is an arithmetic number, because the mean of its divisors is an integer number (3239757).

Almost surely, 2^31247942 is an apocalyptic number.

31247942 is a deficient number, since it is larger than the sum of its proper divisors (20588170).

31247942 is a wasteful number, since it uses less digits than its factorization.

31247942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19543.

The product of its digits is 12096, while the sum is 32.

The square root of 31247942 is about 5589.9858676029. The cubic root of 31247942 is about 314.9733478752.

The spelling of 31247942 in words is "thirty-one million, two hundred forty-seven thousand, nine hundred forty-two".