102399988 has 12 divisors (see below), whose sum is σ = 180050752. Its totient is φ = 50956920.

The previous prime is 102399943. The next prime is 102399989. The reversal of 102399988 is 889993201.

It is a super-4 number, since 4×102399988⁴ (a number of 33 digits) contains 4444 as substring.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59820 + ... + 61507.

Almost surely, 2^102399988 is an apocalyptic number.

It is an amenable number.

102399988 is a deficient number, since it is larger than the sum of its proper divisors (77650764).

102399988 is a wasteful number, since it uses less digits than its factorization.

102399988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121542 (or 121540 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 102399988 is about 10119.2879196117. The cubic root of 102399988 is about 467.8428198389.

The spelling of 102399988 in words is "one hundred two million, three hundred ninety-nine thousand, nine hundred eighty-eight".