99997900 has 18 divisors (see below), whose sum is σ = 216995660. Its totient is φ = 39999120.

The previous prime is 99997897. The next prime is 99997901. The reversal of 99997900 is 979999.

It is not an unprimeable number, because it can be changed into a prime (99997901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 499890 + ... + 500089.

Almost surely, 2^99997900 is an apocalyptic number.

It is an amenable number.

99997900 is an abundant number, since it is smaller than the sum of its proper divisors (116997760).

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

99997900 is a wasteful number, since it uses less digits than its factorization.

99997900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999993 (or 999986 counting only the distinct ones).

The product of its (nonzero) digits is 413343, while the sum is 52.

The square root of 99997900 is about 9999.8949994487. The cubic root of 99997900 is about 464.1556342264.

The spelling of 99997900 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred".