102399999 has 8 divisors (see below), whose sum is σ = 147035952. Its totient is φ = 63015360.

The previous prime is 102399989. The next prime is 102400007. The reversal of 102399999 is 999993201.

It is a Cunningham number, because it is equal to 40⁵-1.

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

It is not a de Polignac number, because 102399999 - 2⁹ = 102399487 is a prime.

102399999 is a modest number, since divided by 99999 gives 1023 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102399989) 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, 1312782 + ... + 1312859.

It is an arithmetic number, because the mean of its divisors is an integer number (18379494).

Almost surely, 2^102399999 is an apocalyptic number.

102399999 is a deficient number, since it is larger than the sum of its proper divisors (44635953).

102399999 is a wasteful number, since it uses less digits than its factorization.

102399999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625657.

The product of its (nonzero) digits is 354294, while the sum is 51.

The square root of 102399999 is about 10119.2884631282. The cubic root of 102399999 is about 467.8428365911.

The spelling of 102399999 in words is "one hundred two million, three hundred ninety-nine thousand, nine hundred ninety-nine".