99997872 has 40 divisors (see below), whose sum is σ = 278200944. Its totient is φ = 30768384.

The previous prime is 99997871. The next prime is 99997873. The reversal of 99997872 is 27879999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99997871) and next prime (99997873).

It is not an unprimeable number, because it can be changed into a prime (99997871) 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, 79503 + ... + 80750.

Almost surely, 2^99997872 is an apocalyptic number.

It is an amenable number.

99997872 is an abundant number, since it is smaller than the sum of its proper divisors (178203072).

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

99997872 is a wasteful number, since it uses less digits than its factorization.

99997872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160277 (or 160271 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 60.

The square root of 99997872 is about 9999.8935994339. The cubic root of 99997872 is about 464.1555909042.

It can be divided in two parts, 9999 and 7872, that added together give a palindrome (17871).

The spelling of 99997872 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred seventy-two".