391423679 has 8 divisors (see below), whose sum is σ = 401572080. Its totient is φ = 381304000.

The previous prime is 391423673. The next prime is 391423717. The reversal of 391423679 is 976324193.

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

It is a cyclic number.

It is not a de Polignac number, because 391423679 - 2⁴ = 391423663 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 (391423673) 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, 21932 + ... + 35550.

It is an arithmetic number, because the mean of its divisors is an integer number (50196510).

Almost surely, 2^391423679 is an apocalyptic number.

391423679 is a deficient number, since it is larger than the sum of its proper divisors (10148401).

391423679 is a wasteful number, since it uses less digits than its factorization.

391423679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14361.

The product of its digits is 244944, while the sum is 44.

The square root of 391423679 is about 19784.4302167133. The cubic root of 391423679 is about 731.5023037232.

The spelling of 391423679 in words is "three hundred ninety-one million, four hundred twenty-three thousand, six hundred seventy-nine".