1808212143 has 4 divisors (see below), whose sum is σ = 2410949528. Its totient is φ = 1205474760.

The previous prime is 1808212129. The next prime is 1808212171. The reversal of 1808212143 is 3412128081.

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

It is not a de Polignac number, because 1808212143 - 2⁴ = 1808212127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1808212143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808212243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301368688 + ... + 301368693.

It is an arithmetic number, because the mean of its divisors is an integer number (602737382).

Almost surely, 2^1808212143 is an apocalyptic number.

1808212143 is a deficient number, since it is larger than the sum of its proper divisors (602737385).

1808212143 is an equidigital number, since it uses as much as digits as its factorization.

1808212143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602737384.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 1808212143 is about 42523.0777696065. The cubic root of 1808212143 is about 1218.2875156087.

The spelling of 1808212143 in words is "one billion, eight hundred eight million, two hundred twelve thousand, one hundred forty-three".