398923612816 has 15 divisors (see below), whose sum is σ = 772919394793. Its totient is φ = 199460543200.

The previous prime is 398923612783. The next prime is 398923612823. The reversal of 398923612816 is 618216329893.

The square root of 398923612816 is 631604.

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

It can be written as a sum of positive squares in only one way, i.e., 117514582416 + 281409030400 = 342804^2 + 530480^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2447466 + ... + 2605366.

Almost surely, 2^398923612816 is an apocalyptic number.

398923612816 is the 631604-th square number.

It is an amenable number.

398923612816 is a deficient number, since it is larger than the sum of its proper divisors (373995781977).

398923612816 is an frugal number, since it uses more digits than its factorization.

398923612816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315810 (or 157903 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 58.

The spelling of 398923612816 in words is "three hundred ninety-eight billion, nine hundred twenty-three million, six hundred twelve thousand, eight hundred sixteen".