399199658769 has 80 divisors (see below), whose sum is σ = 636020187264. Its totient is φ = 248995296000.

The previous prime is 399199658731. The next prime is 399199658801. The reversal of 399199658769 is 967856991993.

399199658769 is a `hidden beast` number, since 399 + 1 + 9 + 96 + 5 + 87 + 69 = 666.

It is not a de Polignac number, because 399199658769 - 2¹² = 399199654673 is a prime.

It is a super-2 number, since 2×399199658769² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (399199650769) 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 79 ways as a sum of consecutive naturals, for example, 15604749 + ... + 15630309.

Almost surely, 2^399199658769 is an apocalyptic number.

It is an amenable number.

399199658769 is a deficient number, since it is larger than the sum of its proper divisors (236820528495).

399199658769 is a wasteful number, since it uses less digits than its factorization.

399199658769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25780 (or 25771 counting only the distinct ones).

The product of its digits is 1785641760, while the sum is 81.

The spelling of 399199658769 in words is "three hundred ninety-nine billion, one hundred ninety-nine million, six hundred fifty-eight thousand, seven hundred sixty-nine".