31977442 has 16 divisors (see below), whose sum is σ = 58043520. Its totient is φ = 12898368.

The previous prime is 31977409. The next prime is 31977443. The reversal of 31977442 is 24477913.

It is not an unprimeable number, because it can be changed into a prime (31977443) 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, 66942 + ... + 67417.

It is an arithmetic number, because the mean of its divisors is an integer number (3627720).

Almost surely, 2^31977442 is an apocalyptic number.

31977442 is a deficient number, since it is larger than the sum of its proper divisors (26066078).

31977442 is a wasteful number, since it uses less digits than its factorization.

31977442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134385.

The product of its digits is 42336, while the sum is 37.

The square root of 31977442 is about 5654.8600336348. The cubic root of 31977442 is about 317.4055916218.

The spelling of 31977442 in words is "thirty-one million, nine hundred seventy-seven thousand, four hundred forty-two".