99999399 has 4 divisors (see below), whose sum is σ = 133332536. Its totient is φ = 66666264.

The previous prime is 99999373. The next prime is 99999401. The reversal of 99999399 is 99399999.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 99999399 - 2¹² = 99995303 is a prime.

It is a super-2 number, since 2×99999399² = 19999759600722402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16666564 + ... + 16666569.

It is an arithmetic number, because the mean of its divisors is an integer number (33333134).

Almost surely, 2^99999399 is an apocalyptic number.

99999399 is a deficient number, since it is larger than the sum of its proper divisors (33333137).

99999399 is a wasteful number, since it uses less digits than its factorization.

99999399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33333136.

The product of its digits is 14348907, while the sum is 66.

The square root of 99999399 is about 9999.9699499548. The cubic root of 99999399 is about 464.1579534945.

The spelling of 99999399 in words is "ninety-nine million, nine hundred ninety-nine thousand, three hundred ninety-nine".