999899400 has 48 divisors (see below), whose sum is σ = 3099690000. Its totient is φ = 266639680.

The previous prime is 999899399. The next prime is 999899429. The reversal of 999899400 is 4998999.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 832650 + ... + 833849.

It is an arithmetic number, because the mean of its divisors is an integer number (64576875).

Almost surely, 2^999899400 is an apocalyptic number.

It is an amenable number.

999899400 is an abundant number, since it is smaller than the sum of its proper divisors (2099790600).

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

999899400 is a wasteful number, since it uses less digits than its factorization.

999899400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666518 (or 1666509 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 57.

The square root of 999899400 is about 31621.1859360145. The cubic root of 999899400 is about 999.9664655421.

The spelling of 999899400 in words is "nine hundred ninety-nine million, eight hundred ninety-nine thousand, four hundred".