18213463 has 2 divisors, whose sum is σ = 18213464. Its totient is φ = 18213462.

The previous prime is 18213449. The next prime is 18213497. The reversal of 18213463 is 36431281.

It is a weak prime.

It is an emirp because it is prime and its reverse (36431281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18213463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18213163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106731 + 9106732.

It is an arithmetic number, because the mean of its divisors is an integer number (9106732).

Almost surely, 2^18213463 is an apocalyptic number.

18213463 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213463 is an equidigital number, since it uses as much as digits as its factorization.

18213463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 18213463 is about 4267.7233977848. The cubic root of 18213463 is about 263.1060548532.

The spelling of 18213463 in words is "eighteen million, two hundred thirteen thousand, four hundred sixty-three".