399805819204 has 81 divisors (see below), whose sum is σ = 789388819639. Its totient is φ = 177044560000.

The previous prime is 399805819201. The next prime is 399805819213. The reversal of 399805819204 is 402918508993.

The square root of 399805819204 is 632302.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 9980409604 + 389825409600 = 99902^2 + 624360^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399805819201) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 570336054 + ... + 570336754.

Almost surely, 2^399805819204 is an apocalyptic number.

399805819204 is the 632302-nd square number.

It is an amenable number.

399805819204 is a deficient number, since it is larger than the sum of its proper divisors (389583000435).

399805819204 is an equidigital number, since it uses as much as digits as its factorization.

399805819204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 399805819204 in words is "three hundred ninety-nine billion, eight hundred five million, eight hundred nineteen thousand, two hundred four".