6402139 has 2 divisors, whose sum is σ = 6402140. Its totient is φ = 6402138.

The previous prime is 6402091. The next prime is 6402157. The reversal of 6402139 is 9312046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6402139 - 2¹¹ = 6400091 is a prime.

It is equal to p₄₃₈₅₄₁ and since 6402139 and 438541 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (6402169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201069 + 3201070.

It is an arithmetic number, because the mean of its divisors is an integer number (3201070).

Almost surely, 2^6402139 is an apocalyptic number.

6402139 is a deficient number, since it is larger than the sum of its proper divisors (1).

6402139 is an equidigital number, since it uses as much as digits as its factorization.

6402139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 6402139 is about 2530.2448498120. The cubic root of 6402139 is about 185.6842351208.

The spelling of 6402139 in words is "six million, four hundred two thousand, one hundred thirty-nine".