18380959 has 2 divisors, whose sum is σ = 18380960. Its totient is φ = 18380958.

The previous prime is 18380951. The next prime is 18380969. The reversal of 18380959 is 95908381.

It is a weak prime.

It is an emirp because it is prime and its reverse (95908381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18380959 - 2³ = 18380951 is a prime.

It is a super-3 number, since 3×18380959³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18380951) 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, 9190479 + 9190480.

It is an arithmetic number, because the mean of its divisors is an integer number (9190480).

Almost surely, 2^18380959 is an apocalyptic number.

18380959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18380959 is an equidigital number, since it uses as much as digits as its factorization.

18380959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18380959 is about 4287.3020654020. The cubic root of 18380959 is about 263.9101268538.

The spelling of 18380959 in words is "eighteen million, three hundred eighty thousand, nine hundred fifty-nine".