99600399 has 24 divisors (see below), whose sum is σ = 152727120. Its totient is φ = 62331648.

The previous prime is 99600377. The next prime is 99600401. The reversal of 99600399 is 99300699.

99600399 is a `hidden beast` number, since 9 + 9 + 600 + 39 + 9 = 666.

It is a Cunningham number, because it is equal to 9980²-1.

It is not a de Polignac number, because 99600399 - 2⁵ = 99600367 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99600349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89257 + ... + 90365.

It is an arithmetic number, because the mean of its divisors is an integer number (6363630).

Almost surely, 2^99600399 is an apocalyptic number.

99600399 is a deficient number, since it is larger than the sum of its proper divisors (53126721).

99600399 is a wasteful number, since it uses less digits than its factorization.

99600399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1716 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 99600399 is about 9979.9999498998. Note that the first 4 decimals coincide. The cubic root of 99600399 is about 463.5397968224.

It can be divided in two parts, 99600 and 399, that added together give a palindrome (99999).

The spelling of 99600399 in words is "ninety-nine million, six hundred thousand, three hundred ninety-nine".