404003665 has 8 divisors (see below), whose sum is σ = 522097128. Its totient is φ = 298341120.

The previous prime is 404003659. The next prime is 404003689. The reversal of 404003665 is 566300404.

It can be written as a sum of positive squares in 4 ways, for example, as 154449 + 403849216 = 393^2 + 20096^2 .

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

It is not a de Polignac number, because 404003665 - 2²¹ = 401906513 is a prime.

It is a super-2 number, since 2×404003665² = 326437922666864450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3107656 + ... + 3107785.

It is an arithmetic number, because the mean of its divisors is an integer number (65262141).

Almost surely, 2^404003665 is an apocalyptic number.

It is an amenable number.

404003665 is a deficient number, since it is larger than the sum of its proper divisors (118093463).

404003665 is a wasteful number, since it uses less digits than its factorization.

404003665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6215459.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 404003665 is about 20099.8424123176. The cubic root of 404003665 is about 739.2564146156.

The spelling of 404003665 in words is "four hundred four million, three thousand, six hundred sixty-five".