400344023 has 2 divisors, whose sum is σ = 400344024. Its totient is φ = 400344022.

The previous prime is 400344011. The next prime is 400344089. The reversal of 400344023 is 320443004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400344023 - 2²⁶ = 333235159 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 400343986 and 400344004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400344223) 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, 200172011 + 200172012.

It is an arithmetic number, because the mean of its divisors is an integer number (200172012).

Almost surely, 2^400344023 is an apocalyptic number.

400344023 is a deficient number, since it is larger than the sum of its proper divisors (1).

400344023 is an equidigital number, since it uses as much as digits as its factorization.

400344023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 400344023 is about 20008.5987265475. The cubic root of 400344023 is about 737.0174711278.

Adding to 400344023 its reverse (320443004), we get a palindrome (720787027).

The spelling of 400344023 in words is "four hundred million, three hundred forty-four thousand, twenty-three".