400320023 has 4 divisors (see below), whose sum is σ = 410083968. Its totient is φ = 390556080.

The previous prime is 400320017. The next prime is 400320047. The reversal of 400320023 is 320023004.

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 400320023 - 2⁴ = 400320007 is a prime.

It is a super-2 number, since 2×400320023² = 320512241629441058, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400320073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4881911 + ... + 4881992.

It is an arithmetic number, because the mean of its divisors is an integer number (102520992).

Almost surely, 2^400320023 is an apocalyptic number.

400320023 is a deficient number, since it is larger than the sum of its proper divisors (9763945).

400320023 is an equidigital number, since it uses as much as digits as its factorization.

400320023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9763944.

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 400320023 is about 20007.9989754098. The cubic root of 400320023 is about 737.0027431508.

Adding to 400320023 its reverse (320023004), we get a palindrome (720343027).

The spelling of 400320023 in words is "four hundred million, three hundred twenty thousand, twenty-three".