400000031143 has 4 divisors (see below), whose sum is σ = 402547802200. Its totient is φ = 397452260088.

The previous prime is 400000031131. The next prime is 400000031267. The reversal of 400000031143 is 341130000004.

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 400000031143 - 2¹³ = 400000022951 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 (400000035143) 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, 1273885293 + ... + 1273885606.

It is an arithmetic number, because the mean of its divisors is an integer number (100636950550).

Almost surely, 2^400000031143 is an apocalyptic number.

400000031143 is a deficient number, since it is larger than the sum of its proper divisors (2547771057).

400000031143 is a wasteful number, since it uses less digits than its factorization.

400000031143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547771056.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 400000031143 its reverse (341130000004), we get a palindrome (741130031147).

The spelling of 400000031143 in words is "four hundred billion, thirty-one thousand, one hundred forty-three".