400656143 has 4 divisors (see below), whose sum is σ = 401071440. Its totient is φ = 400240848.

The previous prime is 400656107. The next prime is 400656161. The reversal of 400656143 is 341656004.

It is a happy number.

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 400656143 - 2⁸ = 400655887 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 (400656103) 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, 206198 + ... + 208131.

It is an arithmetic number, because the mean of its divisors is an integer number (100267860).

Almost surely, 2^400656143 is an apocalyptic number.

400656143 is a deficient number, since it is larger than the sum of its proper divisors (415297).

400656143 is an equidigital number, since it uses as much as digits as its factorization.

400656143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415296.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 400656143 is about 20016.3968535798. The cubic root of 400656143 is about 737.2089548887.

The spelling of 400656143 in words is "four hundred million, six hundred fifty-six thousand, one hundred forty-three".