399509747643 has 8 divisors (see below), whose sum is σ = 532683139408. Its totient is φ = 266338093824.

The previous prime is 399509747629. The next prime is 399509747677. The reversal of 399509747643 is 346747905993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399509747643 - 2²⁵ = 399476193211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399589747643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260871 + ... + 931167.

It is an arithmetic number, because the mean of its divisors is an integer number (66585392426).

Almost surely, 2^399509747643 is an apocalyptic number.

399509747643 is a deficient number, since it is larger than the sum of its proper divisors (133173391765).

399509747643 is a wasteful number, since it uses less digits than its factorization.

399509747643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868973.

The product of its (nonzero) digits is 154314720, while the sum is 66.

The spelling of 399509747643 in words is "three hundred ninety-nine billion, five hundred nine million, seven hundred forty-seven thousand, six hundred forty-three".