404405287 has 16 divisors (see below), whose sum is σ = 476163072. Its totient is φ = 338605920.

The previous prime is 404405237. The next prime is 404405311. The reversal of 404405287 is 782504404.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 404405287 - 2²³ = 396016679 is a prime.

It is a super-3 number, since 3×404405287³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404405207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66738 + ... + 72544.

It is an arithmetic number, because the mean of its divisors is an integer number (29760192).

Almost surely, 2^404405287 is an apocalyptic number.

404405287 is a deficient number, since it is larger than the sum of its proper divisors (71757785).

404405287 is a wasteful number, since it uses less digits than its factorization.

404405287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6318.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 404405287 is about 20109.8306059499. The cubic root of 404405287 is about 739.5012996137.

The spelling of 404405287 in words is "four hundred four million, four hundred five thousand, two hundred eighty-seven".