404305661 has 8 divisors (see below), whose sum is σ = 424030464. Its totient is φ = 384759760.

The previous prime is 404305639. The next prime is 404305667. The reversal of 404305661 is 166503404.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404305661 - 2⁶ = 404305597 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 (404305667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40085 + ... + 49146.

It is an arithmetic number, because the mean of its divisors is an integer number (53003808).

Almost surely, 2^404305661 is an apocalyptic number.

It is an amenable number.

404305661 is a deficient number, since it is larger than the sum of its proper divisors (19724803).

404305661 is a wasteful number, since it uses less digits than its factorization.

404305661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89451.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 404305661 is about 20107.3534061547. The cubic root of 404305661 is about 739.4405687829.

The spelling of 404305661 in words is "four hundred four million, three hundred five thousand, six hundred sixty-one".