391616739 has 12 divisors (see below), whose sum is σ = 567294000. Its totient is φ = 260327664.

The previous prime is 391616723. The next prime is 391616741. The reversal of 391616739 is 937616193.

It is not a de Polignac number, because 391616739 - 2⁴ = 391616723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391616694 and 391616703.

It is not an unprimeable number, because it can be changed into a prime (391616779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59199 + ... + 65480.

It is an arithmetic number, because the mean of its divisors is an integer number (47274500).

Almost surely, 2^391616739 is an apocalyptic number.

391616739 is a deficient number, since it is larger than the sum of its proper divisors (175677261).

391616739 is a wasteful number, since it uses less digits than its factorization.

391616739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125034 (or 125031 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 391616739 is about 19789.3087044495. The cubic root of 391616739 is about 731.6225490655.

The spelling of 391616739 in words is "three hundred ninety-one million, six hundred sixteen thousand, seven hundred thirty-nine".