102399986 has 32 divisors (see below), whose sum is σ = 173759040. Its totient is φ = 44928576.

The previous prime is 102399943. The next prime is 102399989. The reversal of 102399986 is 689993201.

It is a self number, because there is not a number n which added to its sum of digits gives 102399986.

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 15 ways as a sum of consecutive naturals, for example, 49505 + ... + 51531.

It is an arithmetic number, because the mean of its divisors is an integer number (5429970).

Almost surely, 2^102399986 is an apocalyptic number.

102399986 is a deficient number, since it is larger than the sum of its proper divisors (71359054).

102399986 is a wasteful number, since it uses less digits than its factorization.

102399986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 102399986 is about 10119.2878207906. The cubic root of 102399986 is about 467.8428167931.

The spelling of 102399986 in words is "one hundred two million, three hundred ninety-nine thousand, nine hundred eighty-six".