18247819 has 2 divisors, whose sum is σ = 18247820. Its totient is φ = 18247818.

The previous prime is 18247811. The next prime is 18247837. The reversal of 18247819 is 91874281.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18247819 - 2³ = 18247811 is a prime.

It is a super-2 number, since 2×18247819² = 665965796513522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18247811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9123909 + 9123910.

It is an arithmetic number, because the mean of its divisors is an integer number (9123910).

Almost surely, 2^18247819 is an apocalyptic number.

18247819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18247819 is an equidigital number, since it uses as much as digits as its factorization.

18247819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 18247819 is about 4271.7465982897. The cubic root of 18247819 is about 263.2713829951.

The spelling of 18247819 in words is "eighteen million, two hundred forty-seven thousand, eight hundred nineteen".