399179975840839 has 16 divisors (see below), whose sum is σ = 408004121327616. Its totient is φ = 390369654511200.

The previous prime is 399179975840819. The next prime is 399179975840843. The reversal of 399179975840839 is 938048579971993.

It is a cyclic number.

It is not a de Polignac number, because 399179975840839 - 2²¹ = 399179973743687 is a prime.

It is a super-2 number, since 2×399179975840839² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399179975840819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1126269324 + ... + 1126623694.

It is an arithmetic number, because the mean of its divisors is an integer number (25500257582976).

Almost surely, 2^{399179975840839} is an apocalyptic number.

399179975840839 is a deficient number, since it is larger than the sum of its proper divisors (8824145486777).

399179975840839 is a wasteful number, since it uses less digits than its factorization.

399179975840839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373806.

The product of its (nonzero) digits is 33331979520, while the sum is 91.

The spelling of 399179975840839 in words is "three hundred ninety-nine trillion, one hundred seventy-nine billion, nine hundred seventy-five million, eight hundred forty thousand, eight hundred thirty-nine".