999000978 has 32 divisors (see below), whose sum is σ = 2088591360. Its totient is φ = 318174480.

The previous prime is 999000967. The next prime is 999000991. The reversal of 999000978 is 879000999.

It is a self number, because there is not a number n which added to its sum of digits gives 999000978.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19300 + ... + 48687.

It is an arithmetic number, because the mean of its divisors is an integer number (65268480).

Almost surely, 2^999000978 is an apocalyptic number.

999000978 is an abundant number, since it is smaller than the sum of its proper divisors (1089590382).

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

999000978 is a wasteful number, since it uses less digits than its factorization.

999000978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68102.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 999000978 is about 31606.9767298298. The cubic root of 999000978 is about 999.6668817112. Note that the first 3 decimals are identical.

The spelling of 999000978 in words is "nine hundred ninety-nine million, nine hundred seventy-eight", and thus it is an aban number.