400443023 has 4 divisors (see below), whose sum is σ = 410209968. Its totient is φ = 390676080.

The previous prime is 400442983. The next prime is 400443061. The reversal of 400443023 is 320344004.

It is a happy number.

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 400443023 - 2⁸ = 400442767 is a prime.

It is a super-2 number, since 2×400443023² = 320709229338757058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400442986 and 400443004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400443073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4883411 + ... + 4883492.

It is an arithmetic number, because the mean of its divisors is an integer number (102552492).

Almost surely, 2^400443023 is an apocalyptic number.

400443023 is a deficient number, since it is larger than the sum of its proper divisors (9766945).

400443023 is an equidigital number, since it uses as much as digits as its factorization.

400443023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9766944.

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

The square root of 400443023 is about 20011.0725099881. The cubic root of 400443023 is about 737.0782178122.

Adding to 400443023 its reverse (320344004), we get a palindrome (720787027).

The spelling of 400443023 in words is "four hundred million, four hundred forty-three thousand, twenty-three".