99642399 has 8 divisors (see below), whose sum is σ = 133871232. Its totient is φ = 65920920.

The previous prime is 99642343. The next prime is 99642407. The reversal of 99642399 is 99324699.

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

It is not a de Polignac number, because 99642399 - 2⁷ = 99642271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99642329) 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, 126379 + ... + 127164.

It is an arithmetic number, because the mean of its divisors is an integer number (16733904).

Almost surely, 2^99642399 is an apocalyptic number.

99642399 is a deficient number, since it is larger than the sum of its proper divisors (34228833).

99642399 is a wasteful number, since it uses less digits than its factorization.

99642399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253677.

The product of its digits is 944784, while the sum is 51.

The square root of 99642399 is about 9982.1039365456. The cubic root of 99642399 is about 463.6049436014.

The spelling of 99642399 in words is "ninety-nine million, six hundred forty-two thousand, three hundred ninety-nine".