18224639 has 2 divisors, whose sum is σ = 18224640. Its totient is φ = 18224638.

The previous prime is 18224617. The next prime is 18224653. The reversal of 18224639 is 93642281.

It is a strong prime.

It is an emirp because it is prime and its reverse (93642281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18224639 - 2²⁰ = 17176063 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18224599 and 18224608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18224659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9112319 + 9112320.

It is an arithmetic number, because the mean of its divisors is an integer number (9112320).

Almost surely, 2^18224639 is an apocalyptic number.

18224639 is a deficient number, since it is larger than the sum of its proper divisors (1).

18224639 is an equidigital number, since it uses as much as digits as its factorization.

18224639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 18224639 is about 4269.0325601944. The cubic root of 18224639 is about 263.1598588632.

The spelling of 18224639 in words is "eighteen million, two hundred twenty-four thousand, six hundred thirty-nine".