102439 has 4 divisors (see below), whose sum is σ = 103680. Its totient is φ = 101200.

The previous prime is 102437. The next prime is 102451. The reversal of 102439 is 934201.

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

It is a cyclic number.

It is not a de Polignac number, because 102439 - 2¹ = 102437 is a prime.

It is a Duffinian number.

102439 is a modest number, since divided by 2439 gives 1 as remainder.

102439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487 + ... + 664.

It is an arithmetic number, because the mean of its divisors is an integer number (25920).

2¹⁰²⁴³⁹ is an apocalyptic number.

102439 is a deficient number, since it is larger than the sum of its proper divisors (1241).

102439 is an equidigital number, since it uses as much as digits as its factorization.

102439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 102439 is about 320.0609316990. The cubic root of 102439 is about 46.7902224686.

The spelling of 102439 in words is "one hundred two thousand, four hundred thirty-nine".