391039492387 has 4 divisors (see below), whose sum is σ = 391040982640. Its totient is φ = 391038002136.

The previous prime is 391039492351. The next prime is 391039492397. The reversal of 391039492387 is 783294930193.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391039492387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391039492397) 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 3 ways as a sum of consecutive naturals, for example, 235212 + ... + 915097.

It is an arithmetic number, because the mean of its divisors is an integer number (97760245660).

Almost surely, 2^391039492387 is an apocalyptic number.

391039492387 is a deficient number, since it is larger than the sum of its proper divisors (1490253).

391039492387 is a wasteful number, since it uses less digits than its factorization.

391039492387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490252.

The product of its (nonzero) digits is 8817984, while the sum is 58.

The spelling of 391039492387 in words is "three hundred ninety-one billion, thirty-nine million, four hundred ninety-two thousand, three hundred eighty-seven".