404052421 has 4 divisors (see below), whose sum is σ = 405511372. Its totient is φ = 402593472.

The previous prime is 404052403. The next prime is 404052457. The reversal of 404052421 is 124250404.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121308196 + 282744225 = 11014^2 + 16815^2 .

It is a cyclic number.

It is not a de Polignac number, because 404052421 - 2⁹ = 404051909 is a prime.

It is a super-2 number, since 2×404052421² = 326516717831922482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404052392 and 404052401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404052491) 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 3 ways as a sum of consecutive naturals, for example, 729060 + ... + 729613.

It is an arithmetic number, because the mean of its divisors is an integer number (101377843).

Almost surely, 2^404052421 is an apocalyptic number.

It is an amenable number.

404052421 is a deficient number, since it is larger than the sum of its proper divisors (1458951).

404052421 is a wasteful number, since it uses less digits than its factorization.

404052421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458950.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 404052421 is about 20101.0552210574. The cubic root of 404052421 is about 739.2861517517.

The spelling of 404052421 in words is "four hundred four million, fifty-two thousand, four hundred twenty-one".