400001143 has 6 divisors (see below), whose sum is σ = 424915016. Its totient is φ = 376471392.

The previous prime is 400001137. The next prime is 400001159. The reversal of 400001143 is 341100004.

It is not a de Polignac number, because 400001143 - 2⁵ = 400001111 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 (400001113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 691755 + ... + 692332.

Almost surely, 2^400001143 is an apocalyptic number.

400001143 is a deficient number, since it is larger than the sum of its proper divisors (24913873).

400001143 is a wasteful number, since it uses less digits than its factorization.

400001143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384121 (or 1384104 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400001143 is about 20000.0285749796. The cubic root of 400001143 is about 736.8070015354.

Adding to 400001143 its reverse (341100004), we get a palindrome (741101147).

The spelling of 400001143 in words is "four hundred million, one thousand, one hundred forty-three".