990198400 has 48 divisors (see below), whose sum is σ = 2446107390. Its totient is φ = 396078080.

The previous prime is 990198347. The next prime is 990198413. The reversal of 990198400 is 4891099.

It can be written as a sum of positive squares in 3 ways, for example, as 784448064 + 205750336 = 28008^2 + 14344^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151519 + ... + 157918.

Almost surely, 2^990198400 is an apocalyptic number.

It is an amenable number.

990198400 is an abundant number, since it is smaller than the sum of its proper divisors (1455908990).

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

990198400 is a wasteful number, since it uses less digits than its factorization.

990198400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309461 (or 309444 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 990198400 is about 31467.4180701245. The cubic root of 990198400 is about 996.7220668949.

The spelling of 990198400 in words is "nine hundred ninety million, one hundred ninety-eight thousand, four hundred".