400223431 has 2 divisors, whose sum is σ = 400223432. Its totient is φ = 400223430.

The previous prime is 400223407. The next prime is 400223479. The reversal of 400223431 is 134322004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400223431 - 2⁹ = 400222919 is a prime.

It is a super-2 number, since 2×400223431² = 320357589442823522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400223399 and 400223408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400223731) 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, 200111715 + 200111716.

It is an arithmetic number, because the mean of its divisors is an integer number (200111716).

Almost surely, 2^400223431 is an apocalyptic number.

400223431 is a deficient number, since it is larger than the sum of its proper divisors (1).

400223431 is an equidigital number, since it uses as much as digits as its factorization.

400223431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 400223431 is about 20005.5849951957. The cubic root of 400223431 is about 736.9434619996.

Adding to 400223431 its reverse (134322004), we get a palindrome (534545435).

The spelling of 400223431 in words is "four hundred million, two hundred twenty-three thousand, four hundred thirty-one".