399995731907 has 8 divisors (see below), whose sum is σ = 403679845920. Its totient is φ = 396325238400.

The previous prime is 399995731873. The next prime is 399995731979. The reversal of 399995731907 is 709137599993.

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

It is a cyclic number.

It is not a de Polignac number, because 399995731907 - 2⁶ = 399995731843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399995737907) 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, 3346118 + ... + 3463595.

It is an arithmetic number, because the mean of its divisors is an integer number (50459980740).

Almost surely, 2^399995731907 is an apocalyptic number.

399995731907 is a deficient number, since it is larger than the sum of its proper divisors (3684114013).

399995731907 is a wasteful number, since it uses less digits than its factorization.

399995731907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810253.

The product of its (nonzero) digits is 130203045, while the sum is 71.

The spelling of 399995731907 in words is "three hundred ninety-nine billion, nine hundred ninety-five million, seven hundred thirty-one thousand, nine hundred seven".