99999897 has 8 divisors (see below), whose sum is σ = 136434144. Its totient is φ = 65116128.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999897 is 79899999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-99999897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99999827) 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, 387468 + ... + 387725.

It is an arithmetic number, because the mean of its divisors is an integer number (17054268).

Almost surely, 2^99999897 is an apocalyptic number.

It is an amenable number.

99999897 is a deficient number, since it is larger than the sum of its proper divisors (36434247).

99999897 is a wasteful number, since it uses less digits than its factorization.

99999897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775239.

The product of its digits is 29760696, while the sum is 69.

The square root of 99999897 is about 9999.9948499987. The cubic root of 99999897 is about 464.1587240000.

The spelling of 99999897 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-seven".