102839309 has 4 divisors (see below), whose sum is σ = 102859680. Its totient is φ = 102818940.

The previous prime is 102839293. The next prime is 102839327. The reversal of 102839309 is 903938201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 903938201 = 89 ⋅10156609.

It is a cyclic number.

It is not a de Polignac number, because 102839309 - 2⁴ = 102839293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102839329) 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, 3674 + ... + 14804.

It is an arithmetic number, because the mean of its divisors is an integer number (25714920).

Almost surely, 2^102839309 is an apocalyptic number.

It is an amenable number.

102839309 is a deficient number, since it is larger than the sum of its proper divisors (20371).

102839309 is an equidigital number, since it uses as much as digits as its factorization.

102839309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 102839309 is about 10140.9717976139. The cubic root of 102839309 is about 468.5109186960.

The spelling of 102839309 in words is "one hundred two million, eight hundred thirty-nine thousand, three hundred nine".