102402439 has 2 divisors, whose sum is σ = 102402440. Its totient is φ = 102402438.

The previous prime is 102402437. The next prime is 102402449. The reversal of 102402439 is 934204201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102402439 - 2¹ = 102402437 is a prime.

Together with 102402437, it forms a pair of twin primes.

102402439 is a modest number, since divided by 2439 gives 1024 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102402437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51201219 + 51201220.

It is an arithmetic number, because the mean of its divisors is an integer number (51201220).

Almost surely, 2^102402439 is an apocalyptic number.

102402439 is a deficient number, since it is larger than the sum of its proper divisors (1).

102402439 is an equidigital number, since it uses as much as digits as its factorization.

102402439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 102402439 is about 10119.4090242464. The cubic root of 102402439 is about 467.8465525009.

The spelling of 102402439 in words is "one hundred two million, four hundred two thousand, four hundred thirty-nine".