402312143 has 4 divisors (see below), whose sum is σ = 403132008. Its totient is φ = 401492280.

The previous prime is 402312121. The next prime is 402312173. The reversal of 402312143 is 341213204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402312143 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 (402312103) 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, 409196 + ... + 410177.

It is an arithmetic number, because the mean of its divisors is an integer number (100783002).

Almost surely, 2^402312143 is an apocalyptic number.

402312143 is a deficient number, since it is larger than the sum of its proper divisors (819865).

402312143 is an equidigital number, since it uses as much as digits as its factorization.

402312143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819864.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 402312143 is about 20057.7202842197. The cubic root of 402312143 is about 738.2232410227.

Adding to 402312143 its reverse (341213204), we get a palindrome (743525347).

The spelling of 402312143 in words is "four hundred two million, three hundred twelve thousand, one hundred forty-three".