102399989 has 2 divisors, whose sum is σ = 102399990. Its totient is φ = 102399988.

The previous prime is 102399943. The next prime is 102400007. The reversal of 102399989 is 989993201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96687889 + 5712100 = 9833^2 + 2390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102399989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102399589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51199994 + 51199995.

It is an arithmetic number, because the mean of its divisors is an integer number (51199995).

Almost surely, 2^102399989 is an apocalyptic number.

It is an amenable number.

102399989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102399989 is an equidigital number, since it uses as much as digits as its factorization.

102399989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 102399989 is about 10119.2879690223. The cubic root of 102399989 is about 467.8428213619.

The spelling of 102399989 in words is "one hundred two million, three hundred ninety-nine thousand, nine hundred eighty-nine".