400143023 has 4 divisors (see below), whose sum is σ = 457306320. Its totient is φ = 342979728.

The previous prime is 400143019. The next prime is 400143041. The reversal of 400143023 is 320341004.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 400143023 - 2² = 400143019 is a prime.

It is a super-2 number, since 2×400143023² = 320228877711157058, 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 = 400142992 and 400143010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400143013) 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 in 3 ways as a sum of consecutive naturals, for example, 28581638 + ... + 28581651.

It is an arithmetic number, because the mean of its divisors is an integer number (114326580).

Almost surely, 2^400143023 is an apocalyptic number.

400143023 is a deficient number, since it is larger than the sum of its proper divisors (57163297).

400143023 is an equidigital number, since it uses as much as digits as its factorization.

400143023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57163296.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 400143023 is about 20003.5752554387. The cubic root of 400143023 is about 736.8941061365.

Adding to 400143023 its reverse (320341004), we get a palindrome (720484027).

The spelling of 400143023 in words is "four hundred million, one hundred forty-three thousand, twenty-three".