999960000400 has 45 divisors (see below), whose sum is σ = 2402451950961. Its totient is φ = 399976000320.

The previous prime is 999960000379. The next prime is 999960000419. The reversal of 999960000400 is 4000069999.

It is a happy number.

The square root of 999960000400 is 999980.

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., 359985600144 + 639974400256 = 599988^2 + 799984^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19974601 + ... + 20024599.

Almost surely, 2^999960000400 is an apocalyptic number.

999960000400 is the 999980-th square number.

It is an amenable number.

999960000400 is an abundant number, since it is smaller than the sum of its proper divisors (1402491950561).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999960000400 is an frugal number, since it uses more digits than its factorization.

999960000400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100016 (or 50006 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 46.

The spelling of 999960000400 in words is "nine hundred ninety-nine billion, nine hundred sixty million, four hundred", and thus it is an aban number.