6404091 has 4 divisors (see below), whose sum is σ = 8538792. Its totient is φ = 4269392.

The previous prime is 6404089. The next prime is 6404117. The reversal of 6404091 is 1904046.

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

It is a cyclic number.

It is not a de Polignac number, because 6404091 - 2¹ = 6404089 is a prime.

It is a D-number.

6404091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6404191) 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, 1067346 + ... + 1067351.

It is an arithmetic number, because the mean of its divisors is an integer number (2134698).

Almost surely, 2^6404091 is an apocalyptic number.

6404091 is a deficient number, since it is larger than the sum of its proper divisors (2134701).

6404091 is a wasteful number, since it uses less digits than its factorization.

6404091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134700.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 6404091 is about 2530.6305538344. The cubic root of 6404091 is about 185.7031047932.

The spelling of 6404091 in words is "six million, four hundred four thousand, ninety-one".