6404155 has 16 divisors (see below), whose sum is σ = 8281440. Its totient is φ = 4736512.

The previous prime is 6404141. The next prime is 6404161. The reversal of 6404155 is 5514046.

It is a cyclic number.

It is not a de Polignac number, because 6404155 - 2⁹ = 6403643 is a prime.

6404155 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4377 + ... + 5653.

It is an arithmetic number, because the mean of its divisors is an integer number (517590).

Almost surely, 2^6404155 is an apocalyptic number.

6404155 is a deficient number, since it is larger than the sum of its proper divisors (1877285).

6404155 is a wasteful number, since it uses less digits than its factorization.

6404155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 6404155 is about 2530.6431988726. The cubic root of 6404155 is about 185.7037234061.

The spelling of 6404155 in words is "six million, four hundred four thousand, one hundred fifty-five".