989040990 has 48 divisors (see below), whose sum is σ = 2761245072. Its totient is φ = 226066176.

The previous prime is 989040989. The next prime is 989041021. The reversal of 989040990 is 99040989.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 334939 + ... + 337878.

It is an arithmetic number, because the mean of its divisors is an integer number (57525939).

Almost surely, 2^989040990 is an apocalyptic number.

989040990 is an abundant number, since it is smaller than the sum of its proper divisors (1772204082).

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

989040990 is a wasteful number, since it uses less digits than its factorization.

989040990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672841 (or 672834 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 989040990 is about 31449.0220833653. The cubic root of 989040990 is about 996.3335703895. Note that the first 3 decimals are identical.

The spelling of 989040990 in words is "nine hundred eighty-nine million, forty thousand, nine hundred ninety".