102306989 has 4 divisors (see below), whose sum is σ = 102327324. Its totient is φ = 102286656.

The previous prime is 102306979. The next prime is 102307021. The reversal of 102306989 is 989603201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9030025 + 93276964 = 3005^2 + 9658^2 .

It is a cyclic number.

It is not a de Polignac number, because 102306989 - 2⁴ = 102306973 is a prime.

It is a super-2 number, since 2×102306989² = 20933439996492242, 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 (102306929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3539 + ... + 14735.

It is an arithmetic number, because the mean of its divisors is an integer number (25581831).

Almost surely, 2^102306989 is an apocalyptic number.

It is an amenable number.

102306989 is a deficient number, since it is larger than the sum of its proper divisors (20335).

102306989 is an equidigital number, since it uses as much as digits as its factorization.

102306989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20334.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 102306989 is about 10114.6917402361. The cubic root of 102306989 is about 467.7011463440.

The spelling of 102306989 in words is "one hundred two million, three hundred six thousand, nine hundred eighty-nine".