6402155 has 4 divisors (see below), whose sum is σ = 7682592. Its totient is φ = 5121720.

The previous prime is 6402139. The next prime is 6402157. The reversal of 6402155 is 5512046.

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

It is not a de Polignac number, because 6402155 - 2⁴ = 6402139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6402155.

It is not an unprimeable number, because it can be changed into a prime (6402157) 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 in 3 ways as a sum of consecutive naturals, for example, 640211 + ... + 640220.

It is an arithmetic number, because the mean of its divisors is an integer number (1920648).

Almost surely, 2^6402155 is an apocalyptic number.

6402155 is a deficient number, since it is larger than the sum of its proper divisors (1280437).

6402155 is a wasteful number, since it uses less digits than its factorization.

6402155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280436.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 6402155 is about 2530.2480115593. The cubic root of 6402155 is about 185.6843898059.

The spelling of 6402155 in words is "six million, four hundred two thousand, one hundred fifty-five".