404955721 has 12 divisors (see below), whose sum is σ = 428256192. Its totient is φ = 382866264.

The previous prime is 404955709. The next prime is 404955767. The reversal of 404955721 is 127559404.

It is not a de Polignac number, because 404955721 - 2⁵ = 404955689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404953721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261676 + ... + 263218.

It is an arithmetic number, because the mean of its divisors is an integer number (35688016).

Almost surely, 2^404955721 is an apocalyptic number.

It is an amenable number.

404955721 is a deficient number, since it is larger than the sum of its proper divisors (23300471).

404955721 is a wasteful number, since it uses less digits than its factorization.

404955721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308 (or 2289 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 404955721 is about 20123.5116468274. The cubic root of 404955721 is about 739.8366580067.

The spelling of 404955721 in words is "four hundred four million, nine hundred fifty-five thousand, seven hundred twenty-one".