404865561 has 8 divisors (see below), whose sum is σ = 539922240. Its totient is φ = 269859632.

The previous prime is 404865541. The next prime is 404865563. The reversal of 404865561 is 165568404.

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 404865561 - 2⁹ = 404865049 is a prime.

It is a super-2 number, since 2×404865561² = 327832244967689442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (404865563) 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, 13876 + ... + 31658.

It is an arithmetic number, because the mean of its divisors is an integer number (67490280).

Almost surely, 2^404865561 is an apocalyptic number.

It is an amenable number.

404865561 is a deficient number, since it is larger than the sum of its proper divisors (135056679).

404865561 is a wasteful number, since it uses less digits than its factorization.

404865561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25375.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 404865561 is about 20121.2713564526. The cubic root of 404865561 is about 739.7817477860.

The spelling of 404865561 in words is "four hundred four million, eight hundred sixty-five thousand, five hundred sixty-one".