399516859 has 8 divisors (see below), whose sum is σ = 456742880. Its totient is φ = 342328896.

The previous prime is 399516853. The next prime is 399516863. The reversal of 399516859 is 958615993.

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

It is not a de Polignac number, because 399516859 - 2¹³ = 399508667 is a prime.

It is a super-3 number, since 3×399516859³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399516853) 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, 18487 + ... + 33775.

It is an arithmetic number, because the mean of its divisors is an integer number (57092860).

Almost surely, 2^399516859 is an apocalyptic number.

399516859 is a deficient number, since it is larger than the sum of its proper divisors (57226021).

399516859 is a wasteful number, since it uses less digits than its factorization.

399516859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19029.

The product of its digits is 2624400, while the sum is 55.

The square root of 399516859 is about 19987.9178255265. The cubic root of 399516859 is about 736.5095291006.

The spelling of 399516859 in words is "three hundred ninety-nine million, five hundred sixteen thousand, eight hundred fifty-nine".