404565641 has 4 divisors (see below), whose sum is σ = 404726784. Its totient is φ = 404404500.

The previous prime is 404565617. The next prime is 404565647. The reversal of 404565641 is 146565404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 404565641 - 2²² = 400371337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404565647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76745 + ... + 81846.

It is an arithmetic number, because the mean of its divisors is an integer number (101181696).

Almost surely, 2^404565641 is an apocalyptic number.

It is an amenable number.

404565641 is a deficient number, since it is larger than the sum of its proper divisors (161143).

404565641 is a wasteful number, since it uses less digits than its factorization.

404565641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161142.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 404565641 is about 20113.8171663163. The cubic root of 404565641 is about 739.5990285714.

The spelling of 404565641 in words is "four hundred four million, five hundred sixty-five thousand, six hundred forty-one".