391938157679 has 4 divisors (see below), whose sum is σ = 391944194976. Its totient is φ = 391932120384.

The previous prime is 391938157673. The next prime is 391938157703. The reversal of 391938157679 is 976751839193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 391938157679 - 2³² = 387643190383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391938157673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2920199 + ... + 3051464.

It is an arithmetic number, because the mean of its divisors is an integer number (97986048744).

Almost surely, 2^391938157679 is an apocalyptic number.

391938157679 is a deficient number, since it is larger than the sum of its proper divisors (6037297).

391938157679 is an equidigital number, since it uses as much as digits as its factorization.

391938157679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6037296.

The product of its digits is 77157360, while the sum is 68.

The spelling of 391938157679 in words is "three hundred ninety-one billion, nine hundred thirty-eight million, one hundred fifty-seven thousand, six hundred seventy-nine".