18285919 has 2 divisors, whose sum is σ = 18285920. Its totient is φ = 18285918.

The previous prime is 18285889. The next prime is 18285983. The reversal of 18285919 is 91958281.

It is a weak prime.

It is an emirp because it is prime and its reverse (91958281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18285919 - 2⁷ = 18285791 is a prime.

It is a super-2 number, since 2×18285919² = 668749667349122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18225919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9142959 + 9142960.

It is an arithmetic number, because the mean of its divisors is an integer number (9142960).

Almost surely, 2^18285919 is an apocalyptic number.

18285919 is a deficient number, since it is larger than the sum of its proper divisors (1).

18285919 is an equidigital number, since it uses as much as digits as its factorization.

18285919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 43.

The square root of 18285919 is about 4276.2038071168. The cubic root of 18285919 is about 263.4544855478.

The spelling of 18285919 in words is "eighteen million, two hundred eighty-five thousand, nine hundred nineteen".