393929136731 has 4 divisors (see below), whose sum is σ = 424231378032. Its totient is φ = 363626895432.

The previous prime is 393929136701. The next prime is 393929136749. The reversal of 393929136731 is 137631929393.

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-393929136731 is a prime.

It is a super-2 number, since 2×393929136731² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393929136701) 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, 15151120631 + ... + 15151120656.

It is an arithmetic number, because the mean of its divisors is an integer number (106057844508).

Almost surely, 2^393929136731 is an apocalyptic number.

393929136731 is a deficient number, since it is larger than the sum of its proper divisors (30302241301).

393929136731 is a wasteful number, since it uses less digits than its factorization.

393929136731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30302241300.

The product of its digits is 4960116, while the sum is 56.

The spelling of 393929136731 in words is "three hundred ninety-three billion, nine hundred twenty-nine million, one hundred thirty-six thousand, seven hundred thirty-one".