404517421 has 16 divisors (see below), whose sum is σ = 508970880. Its totient is φ = 312310080.

The previous prime is 404517409. The next prime is 404517437. The reversal of 404517421 is 124715404.

It is a cyclic number.

It is not a de Polignac number, because 404517421 - 2⁷ = 404517293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404517421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404517401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15706 + ... + 32491.

It is an arithmetic number, because the mean of its divisors is an integer number (31810680).

Almost surely, 2^404517421 is an apocalyptic number.

It is an amenable number.

404517421 is a deficient number, since it is larger than the sum of its proper divisors (104453459).

404517421 is a wasteful number, since it uses less digits than its factorization.

404517421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48324.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 404517421 is about 20112.6184521061. The cubic root of 404517421 is about 739.5696432434.

The spelling of 404517421 in words is "four hundred four million, five hundred seventeen thousand, four hundred twenty-one".