400006143 has 24 divisors (see below), whose sum is σ = 593289216. Its totient is φ = 259578000.

The previous prime is 400006121. The next prime is 400006177. The reversal of 400006143 is 341600004.

It is not a de Polignac number, because 400006143 - 2⁵ = 400006111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400006643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78318 + ... + 83268.

It is an arithmetic number, because the mean of its divisors is an integer number (24720384).

Almost surely, 2^400006143 is an apocalyptic number.

400006143 is a deficient number, since it is larger than the sum of its proper divisors (193283073).

400006143 is a wasteful number, since it uses less digits than its factorization.

400006143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195 (or 5192 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 400006143 is about 20000.1535744104. The cubic root of 400006143 is about 736.8100715430.

Adding to 400006143 its reverse (341600004), we get a palindrome (741606147).

The spelling of 400006143 in words is "four hundred million, six thousand, one hundred forty-three".