404234431 has 4 divisors (see below), whose sum is σ = 404278000. Its totient is φ = 404190864.

The previous prime is 404234423. The next prime is 404234437. The reversal of 404234431 is 134432404.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 404234431 - 2³ = 404234423 is a prime.

It is a super-2 number, since 2×404234431² = 326810950411787522, 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 = 404234396 and 404234405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404234437) 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, 1686 + ... + 28483.

It is an arithmetic number, because the mean of its divisors is an integer number (101069500).

Almost surely, 2^404234431 is an apocalyptic number.

404234431 is a deficient number, since it is larger than the sum of its proper divisors (43569).

404234431 is a wasteful number, since it uses less digits than its factorization.

404234431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43568.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 404234431 is about 20105.5820855801. The cubic root of 404234431 is about 739.3971417010.

Adding to 404234431 its reverse (134432404), we get a palindrome (538666835).

The spelling of 404234431 in words is "four hundred four million, two hundred thirty-four thousand, four hundred thirty-one".