999989982 has 32 divisors (see below), whose sum is σ = 2224265760. Its totient is φ = 333020160.

The previous prime is 999989981. The next prime is 999990011. The reversal of 999989982 is 289989999.

It is a self number, because there is not a number n which added to its sum of digits gives 999989982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999989981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54232 + ... + 70292.

It is an arithmetic number, because the mean of its divisors is an integer number (69508305).

Almost surely, 2^999989982 is an apocalyptic number.

999989982 is an abundant number, since it is smaller than the sum of its proper divisors (1224275778).

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

999989982 is a wasteful number, since it uses less digits than its factorization.

999989982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17225 (or 17219 counting only the distinct ones).

The product of its digits is 68024448, while the sum is 72.

The square root of 999989982 is about 31622.6182027991. The cubic root of 999989982 is about 999.9966606555.

The spelling of 999989982 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, nine hundred eighty-two".