989929990 has 32 divisors (see below), whose sum is σ = 2037513024. Its totient is φ = 339223680.

The previous prime is 989929981. The next prime is 989929999. The reversal of 989929990 is 99929989.

It is an interprime number because it is at equal distance from previous prime (989929981) and next prime (989929999).

It is a super-2 number, since 2×989929990² = 1959922770202800200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989929999) 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, 244180 + ... + 248200.

It is an arithmetic number, because the mean of its divisors is an integer number (63672282).

Almost surely, 2^989929990 is an apocalyptic number.

989929990 is an abundant number, since it is smaller than the sum of its proper divisors (1047583034).

989929990 is a wasteful number, since it uses less digits than its factorization.

989929990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552.

The product of its (nonzero) digits is 8503056, while the sum is 64.

The square root of 989929990 is about 31463.1528935039. The cubic root of 989929990 is about 996.6319993062.

The spelling of 989929990 in words is "nine hundred eighty-nine million, nine hundred twenty-nine thousand, nine hundred ninety".