400811143 has 4 divisors (see below), whose sum is σ = 402561640. Its totient is φ = 399060648.

The previous prime is 400811141. The next prime is 400811149. The reversal of 400811143 is 341118004.

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 400811143 - 2¹ = 400811141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400811141) 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, 874905 + ... + 875362.

It is an arithmetic number, because the mean of its divisors is an integer number (100640410).

Almost surely, 2^400811143 is an apocalyptic number.

400811143 is a deficient number, since it is larger than the sum of its proper divisors (1750497).

400811143 is a wasteful number, since it uses less digits than its factorization.

400811143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750496.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 400811143 is about 20020.2683048954. The cubic root of 400811143 is about 737.3040095117.

Adding to 400811143 its reverse (341118004), we get a palindrome (741929147).

It can be divided in two parts, 4008 and 11143, that added together give a palindrome (15151).

The spelling of 400811143 in words is "four hundred million, eight hundred eleven thousand, one hundred forty-three".