999609900 has 144 divisors (see below), whose sum is σ = 3034639104. Its totient is φ = 253566720.

The previous prime is 999609899. The next prime is 999609977. The reversal of 999609900 is 9906999.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1911039 + ... + 1911561.

Almost surely, 2^999609900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999609900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1517319552).

999609900 is an abundant number, since it is smaller than the sum of its proper divisors (2035029204).

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

999609900 is a wasteful number, since it uses less digits than its factorization.

999609900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 354294, while the sum is 51.

The square root of 999609900 is about 31616.6079774539. The cubic root of 999609900 is about 999.8699497543.

The spelling of 999609900 in words is "nine hundred ninety-nine million, six hundred nine thousand, nine hundred".