404405231 has 16 divisors (see below), whose sum is σ = 436389120. Its totient is φ = 373401600.

The previous prime is 404405207. The next prime is 404405237. The reversal of 404405231 is 132504404.

It is not a de Polignac number, because 404405231 - 2⁶ = 404405167 is a prime.

It is a super-2 number, since 2×404405231² = 327087181720326722, 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 = 404405197 and 404405206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404405237) 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, 206306 + ... + 208256.

It is an arithmetic number, because the mean of its divisors is an integer number (27274320).

Almost surely, 2^404405231 is an apocalyptic number.

404405231 is a deficient number, since it is larger than the sum of its proper divisors (31983889).

404405231 is a wasteful number, since it uses less digits than its factorization.

404405231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 404405231 is about 20109.8292135960. The cubic root of 404405231 is about 739.5012654796.

Adding to 404405231 its reverse (132504404), we get a palindrome (536909635).

The spelling of 404405231 in words is "four hundred four million, four hundred five thousand, two hundred thirty-one".