391000192042 has 8 divisors (see below), whose sum is σ = 597566331396. Its totient is φ = 191811414912.

The previous prime is 391000192019. The next prime is 391000192043. The reversal of 391000192042 is 240291000193.

It can be written as a sum of positive squares in 2 ways, for example, as 358862100601 + 32138091441 = 599051^2 + 179271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 391000191995 and 391000192013.

It is not an unprimeable number, because it can be changed into a prime (391000192043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844340423 + ... + 1844340634.

Almost surely, 2^391000192042 is an apocalyptic number.

391000192042 is a deficient number, since it is larger than the sum of its proper divisors (206566139354).

391000192042 is a wasteful number, since it uses less digits than its factorization.

391000192042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688681112.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 391000192042 in words is "three hundred ninety-one billion, one hundred ninety-two thousand, forty-two".