399709115169 has 96 divisors (see below), whose sum is σ = 719929042560. Its totient is φ = 194866560000.

The previous prime is 399709115129. The next prime is 399709115171. The reversal of 399709115169 is 961511907993.

It is a happy number.

It is not a de Polignac number, because 399709115169 - 2¹¹ = 399709113121 is a prime.

It is a super-2 number, since 2×399709115169² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399709115129) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1354419 + ... + 1622919.

It is an arithmetic number, because the mean of its divisors is an integer number (7499260860).

Almost surely, 2^399709115169 is an apocalyptic number.

399709115169 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

399709115169 is a deficient number, since it is larger than the sum of its proper divisors (320219927391).

399709115169 is a wasteful number, since it uses less digits than its factorization.

399709115169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268591 (or 268584 counting only the distinct ones).

The product of its (nonzero) digits is 4133430, while the sum is 60.

The spelling of 399709115169 in words is "three hundred ninety-nine billion, seven hundred nine million, one hundred fifteen thousand, one hundred sixty-nine".