400224431 has 2 divisors, whose sum is σ = 400224432. Its totient is φ = 400224430.

The previous prime is 400224427. The next prime is 400224439. The reversal of 400224431 is 134422004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400224431 - 2² = 400224427 is a prime.

It is a super-2 number, since 2×400224431² = 320359190338547522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400224439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200112215 + 200112216.

It is an arithmetic number, because the mean of its divisors is an integer number (200112216).

Almost surely, 2^400224431 is an apocalyptic number.

400224431 is a deficient number, since it is larger than the sum of its proper divisors (1).

400224431 is an equidigital number, since it uses as much as digits as its factorization.

400224431 is an odious number, because the sum of its binary digits is odd.

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

The square root of 400224431 is about 20005.6099882008. The cubic root of 400224431 is about 736.9440757758.

Adding to 400224431 its reverse (134422004), we get a palindrome (534646435).

The spelling of 400224431 in words is "four hundred million, two hundred twenty-four thousand, four hundred thirty-one".