6402685 has 4 divisors (see below), whose sum is σ = 7683228. Its totient is φ = 5122144.

The previous prime is 6402661. The next prime is 6402701. The reversal of 6402685 is 5862046.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4481689 + 1920996 = 2117^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 6402685 - 2⁵ = 6402653 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640264 + ... + 640273.

It is an arithmetic number, because the mean of its divisors is an integer number (1920807).

Almost surely, 2^6402685 is an apocalyptic number.

It is an amenable number.

6402685 is a deficient number, since it is larger than the sum of its proper divisors (1280543).

6402685 is a wasteful number, since it uses less digits than its factorization.

6402685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280542.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 6402685 is about 2530.3527422081. The cubic root of 6402685 is about 185.6895136020.

The spelling of 6402685 in words is "six million, four hundred two thousand, six hundred eighty-five".