391900042 has 16 divisors (see below), whose sum is σ = 619826400. Its totient is φ = 185325840.

The previous prime is 391900039. The next prime is 391900057. The reversal of 391900042 is 240009193.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15192 + ... + 31852.

It is an arithmetic number, because the mean of its divisors is an integer number (38739150).

Almost surely, 2^391900042 is an apocalyptic number.

391900042 is a deficient number, since it is larger than the sum of its proper divisors (227926358).

391900042 is a wasteful number, since it uses less digits than its factorization.

391900042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17301.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 391900042 is about 19796.4653915794. The cubic root of 391900042 is about 731.7989297640.

The spelling of 391900042 in words is "three hundred ninety-one million, nine hundred thousand, forty-two".