399676618745 has 16 divisors (see below), whose sum is σ = 484397277840. Its totient is φ = 316551552000.

The previous prime is 399676618727. The next prime is 399676618753. The reversal of 399676618745 is 547816676993.

It can be written as a sum of positive squares in 8 ways, for example, as 241864289209 + 157812329536 = 491797^2 + 397256^2 .

It is not a de Polignac number, because 399676618745 - 2⁸ = 399676618489 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 9882365 + ... + 9922725.

It is an arithmetic number, because the mean of its divisors is an integer number (30274829865).

Almost surely, 2^399676618745 is an apocalyptic number.

It is an amenable number.

399676618745 is a deficient number, since it is larger than the sum of its proper divisors (84720659095).

399676618745 is a wasteful number, since it uses less digits than its factorization.

399676618745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60076.

The product of its digits is 411505920, while the sum is 71.

The spelling of 399676618745 in words is "three hundred ninety-nine billion, six hundred seventy-six million, six hundred eighteen thousand, seven hundred forty-five".