18812263 has 2 divisors, whose sum is σ = 18812264. Its totient is φ = 18812262.

The previous prime is 18812249. The next prime is 18812273. The reversal of 18812263 is 36221881.

It is a strong prime.

It is an emirp because it is prime and its reverse (36221881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18812263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18812203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9406131 + 9406132.

It is an arithmetic number, because the mean of its divisors is an integer number (9406132).

Almost surely, 2^18812263 is an apocalyptic number.

18812263 is a deficient number, since it is larger than the sum of its proper divisors (1).

18812263 is an equidigital number, since it uses as much as digits as its factorization.

18812263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 18812263 is about 4337.3105722325. The cubic root of 18812263 is about 265.9583809987.

The spelling of 18812263 in words is "eighteen million, eight hundred twelve thousand, two hundred sixty-three".