6402005 has 4 divisors (see below), whose sum is σ = 7682412. Its totient is φ = 5121600.

The previous prime is 6402001. The next prime is 6402007. The reversal of 6402005 is 5002046.

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 1745041 + 4656964 = 1321^2 + 2158^2 .

It is not a de Polignac number, because 6402005 - 2² = 6402001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6402001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640196 + ... + 640205.

It is an arithmetic number, because the mean of its divisors is an integer number (1920603).

Almost surely, 2^6402005 is an apocalyptic number.

It is an amenable number.

6402005 is a deficient number, since it is larger than the sum of its proper divisors (1280407).

6402005 is a wasteful number, since it uses less digits than its factorization.

6402005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280406.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 6402005 is about 2530.2183700226. The cubic root of 6402005 is about 185.6829396236.

The spelling of 6402005 in words is "six million, four hundred two thousand, five".