6402865 has 16 divisors (see below), whose sum is σ = 8928000. Its totient is φ = 4317120.

The previous prime is 6402859. The next prime is 6402883. The reversal of 6402865 is 5682046.

It is a de Polignac number, because none of the positive numbers 2^k-6402865 is a prime.

It is an Ulam number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 636 + ... + 3634.

It is an arithmetic number, because the mean of its divisors is an integer number (558000).

Almost surely, 2^6402865 is an apocalyptic number.

It is an amenable number.

6402865 is a deficient number, since it is larger than the sum of its proper divisors (2525135).

6402865 is a wasteful number, since it uses less digits than its factorization.

6402865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072.

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

The square root of 6402865 is about 2530.3883101216. The cubic root of 6402865 is about 185.6912536949.

The spelling of 6402865 in words is "six million, four hundred two thousand, eight hundred sixty-five".