18216463 has 2 divisors, whose sum is σ = 18216464. Its totient is φ = 18216462.

The previous prime is 18216449. The next prime is 18216509. The reversal of 18216463 is 36461281.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18216463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18216403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9108231 + 9108232.

It is an arithmetic number, because the mean of its divisors is an integer number (9108232).

Almost surely, 2^18216463 is an apocalyptic number.

18216463 is a deficient number, since it is larger than the sum of its proper divisors (1).

18216463 is an equidigital number, since it uses as much as digits as its factorization.

18216463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 18216463 is about 4268.0748587624. The cubic root of 18216463 is about 263.1204997510.

The spelling of 18216463 in words is "eighteen million, two hundred sixteen thousand, four hundred sixty-three".