18212143 has 2 divisors, whose sum is σ = 18212144. Its totient is φ = 18212142.

The previous prime is 18212123. The next prime is 18212147. The reversal of 18212143 is 34121281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18212143 - 2⁵ = 18212111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18212147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106071 + 9106072.

It is an arithmetic number, because the mean of its divisors is an integer number (9106072).

Almost surely, 2^18212143 is an apocalyptic number.

18212143 is a deficient number, since it is larger than the sum of its proper divisors (1).

18212143 is an equidigital number, since it uses as much as digits as its factorization.

18212143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 22.

The square root of 18212143 is about 4267.5687457849. The cubic root of 18212143 is about 263.0996985957.

The spelling of 18212143 in words is "eighteen million, two hundred twelve thousand, one hundred forty-three".