404220431 has 4 divisors (see below), whose sum is σ = 405228864. Its totient is φ = 403212000.

The previous prime is 404220409. The next prime is 404220433. The reversal of 404220431 is 134022404.

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

It is a cyclic number.

It is not a de Polignac number, because 404220431 - 2²² = 400026127 is a prime.

It is a super-2 number, since 2×404220431² = 326788313675651522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404220433) 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, 503615 + ... + 504416.

It is an arithmetic number, because the mean of its divisors is an integer number (101307216).

Almost surely, 2^404220431 is an apocalyptic number.

404220431 is a deficient number, since it is larger than the sum of its proper divisors (1008433).

404220431 is a wasteful number, since it uses less digits than its factorization.

404220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008432.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 404220431 is about 20105.2339205491. The cubic root of 404220431 is about 739.3886056646.

Adding to 404220431 its reverse (134022404), we get a palindrome (538242835).

The spelling of 404220431 in words is "four hundred four million, two hundred twenty thousand, four hundred thirty-one".