402839 has 6 divisors (see below), whose sum is σ = 418080. Its totient is φ = 388136.

The previous prime is 402823. The next prime is 402847. The reversal of 402839 is 938204.

It is not a de Polignac number, because 402839 - 2⁴ = 402823 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6 and base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 602 + ... + 1080.

It is an arithmetic number, because the mean of its divisors is an integer number (69680).

2⁴⁰²⁸³⁹ is an apocalyptic number.

402839 is a deficient number, since it is larger than the sum of its proper divisors (15241).

402839 is an equidigital number, since it uses as much as digits as its factorization.

402839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 402839 is about 634.6959902189. The cubic root of 402839 is about 73.8545352789.

The spelling of 402839 in words is "four hundred two thousand, eight hundred thirty-nine".