404500421 has 4 divisors (see below), whose sum is σ = 435615852. Its totient is φ = 373384992.

The previous prime is 404500409. The next prime is 404500433. The reversal of 404500421 is 124005404.

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

It is an interprime number because it is at equal distance from previous prime (404500409) and next prime (404500433).

It can be written as a sum of positive squares in 2 ways, for example, as 90820900 + 313679521 = 9530^2 + 17711^2 .

It is a cyclic number.

It is not a de Polignac number, because 404500421 - 2⁶ = 404500357 is a prime.

It is a super-3 number, since 3×404500421³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404500393 and 404500402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404500451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15557696 + ... + 15557721.

It is an arithmetic number, because the mean of its divisors is an integer number (108903963).

Almost surely, 2^404500421 is an apocalyptic number.

It is an amenable number.

404500421 is a deficient number, since it is larger than the sum of its proper divisors (31115431).

404500421 is a wasteful number, since it uses less digits than its factorization.

404500421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31115430.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 404500421 is about 20112.1958274078. The cubic root of 404500421 is about 739.5592828655.

Adding to 404500421 its reverse (124005404), we get a palindrome (528505825).

The spelling of 404500421 in words is "four hundred four million, five hundred thousand, four hundred twenty-one".