404623431 has 40 divisors (see below), whose sum is σ = 618704944. Its totient is φ = 264539520.

The previous prime is 404623403. The next prime is 404623433. The reversal of 404623431 is 134326404.

404623431 is a `hidden beast` number, since 4 + 0 + 4 + 623 + 4 + 31 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-404623431 is a prime.

It is a super-2 number, since 2×404623431² = 327440241828423522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 404623395 and 404623404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404623433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1200495 + ... + 1200831.

Almost surely, 2^404623431 is an apocalyptic number.

404623431 is a deficient number, since it is larger than the sum of its proper divisors (214081513).

404623431 is an frugal number, since it uses more digits than its factorization.

404623431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 404623431 is about 20115.2536896754. The cubic root of 404623431 is about 739.6342427934.

Adding to 404623431 its reverse (134326404), we get a palindrome (538949835).

The spelling of 404623431 in words is "four hundred four million, six hundred twenty-three thousand, four hundred thirty-one".