999980989 has 8 divisors (see below), whose sum is σ = 1143362880. Its totient is φ = 856730976.

The previous prime is 999980923. The next prime is 999981011. The reversal of 999980989 is 989089999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999980989 is a prime.

It is a super-2 number, since 2×999980989² = 1999923956722836242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999980489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16144 + ... + 47545.

It is an arithmetic number, because the mean of its divisors is an integer number (142920360).

Almost surely, 2^999980989 is an apocalyptic number.

It is an amenable number.

999980989 is a deficient number, since it is larger than the sum of its proper divisors (143381891).

999980989 is a wasteful number, since it uses less digits than its factorization.

999980989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65939.

The product of its (nonzero) digits is 34012224, while the sum is 70.

The square root of 999980989 is about 31622.4760099522. The cubic root of 999980989 is about 999.9936629598.

The spelling of 999980989 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, nine hundred eighty-nine".