6402839 has 2 divisors, whose sum is σ = 6402840. Its totient is φ = 6402838.

The previous prime is 6402817. The next prime is 6402841. The reversal of 6402839 is 9382046.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6402839 is a prime.

It is a Sophie Germain prime.

Together with 6402841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6402859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201419 + 3201420.

It is an arithmetic number, because the mean of its divisors is an integer number (3201420).

Almost surely, 2^6402839 is an apocalyptic number.

6402839 is a deficient number, since it is larger than the sum of its proper divisors (1).

6402839 is an equidigital number, since it uses as much as digits as its factorization.

6402839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 6402839 is about 2530.3831725650. The cubic root of 6402839 is about 185.6910023501.

The spelling of 6402839 in words is "six million, four hundred two thousand, eight hundred thirty-nine".