18339337 has 2 divisors, whose sum is σ = 18339338. Its totient is φ = 18339336.

The previous prime is 18339329. The next prime is 18339361. The reversal of 18339337 is 73393381.

18339337 is nontrivially palindromic in base 13.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17943696 + 395641 = 4236^2 + 629^2 .

It is an emirp because it is prime and its reverse (73393381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18339337 - 2³ = 18339329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18339296 and 18339305.

It is not a weakly prime, because it can be changed into another prime (18339317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9169668 + 9169669.

It is an arithmetic number, because the mean of its divisors is an integer number (9169669).

Almost surely, 2^18339337 is an apocalyptic number.

It is an amenable number.

18339337 is a deficient number, since it is larger than the sum of its proper divisors (1).

18339337 is an equidigital number, since it uses as much as digits as its factorization.

18339337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 18339337 is about 4282.4452127260. The cubic root of 18339337 is about 263.7107761950.

It can be divided in two parts, 1 and 8339337, that added together give a palindrome (8339338).

The spelling of 18339337 in words is "eighteen million, three hundred thirty-nine thousand, three hundred thirty-seven".