99840988 has 24 divisors (see below), whose sum is σ = 190976912. Its totient is φ = 45391104.

The previous prime is 99840971. The next prime is 99841031. The reversal of 99840988 is 88904899.

It is a super-2 number, since 2×99840988² = 19936445769632288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10845 + ... + 17812.

Almost surely, 2^99840988 is an apocalyptic number.

It is an amenable number.

99840988 is a deficient number, since it is larger than the sum of its proper divisors (91135924).

99840988 is a wasteful number, since it uses less digits than its factorization.

99840988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28741 (or 28739 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The square root of 99840988 is about 9992.0462368826. The cubic root of 99840988 is about 463.9127300695.

The spelling of 99840988 in words is "ninety-nine million, eight hundred forty thousand, nine hundred eighty-eight".