999899376 has 80 divisors (see below), whose sum is σ = 2970357504. Its totient is φ = 283917312.

The previous prime is 999899333. The next prime is 999899399. The reversal of 999899376 is 673998999.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 999899376.

It is a congruent number.

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, 45640 + ... + 63896.

Almost surely, 2^999899376 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 999899376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1485178752).

999899376 is an abundant number, since it is smaller than the sum of its proper divisors (1970458128).

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

999899376 is a wasteful number, since it uses less digits than its factorization.

999899376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18438 (or 18432 counting only the distinct ones).

The product of its digits is 59521392, while the sum is 69.

The square root of 999899376 is about 31621.1855565221. The cubic root of 999899376 is about 999.9664575416.

The spelling of 999899376 in words is "nine hundred ninety-nine million, eight hundred ninety-nine thousand, three hundred seventy-six".