400424023 has 2 divisors, whose sum is σ = 400424024. Its totient is φ = 400424022.

The previous prime is 400423979. The next prime is 400424029. The reversal of 400424023 is 320424004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400424023 - 2⁹ = 400423511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400424029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200212011 + 200212012.

It is an arithmetic number, because the mean of its divisors is an integer number (200212012).

Almost surely, 2^400424023 is an apocalyptic number.

400424023 is a deficient number, since it is larger than the sum of its proper divisors (1).

400424023 is an equidigital number, since it uses as much as digits as its factorization.

400424023 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 19.

The square root of 400424023 is about 20010.5977671833. The cubic root of 400424023 is about 737.0665601341.

Subtracting from 400424023 its sum of digits (19), we obtain a palindrome (400424004).

Adding to 400424023 its reverse (320424004), we get a palindrome (720848027).

The spelling of 400424023 in words is "four hundred million, four hundred twenty-four thousand, twenty-three".