18685049 has 2 divisors, whose sum is σ = 18685050. Its totient is φ = 18685048.

The previous prime is 18685003. The next prime is 18685067. The reversal of 18685049 is 94058681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 469225 = 4268^2 + 685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18685049 is a prime.

It is a super-2 number, since 2×18685049² = 698262112264802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18684997 and 18685015.

It is not a weakly prime, because it can be changed into another prime (18685099) 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, 9342524 + 9342525.

It is an arithmetic number, because the mean of its divisors is an integer number (9342525).

Almost surely, 2^18685049 is an apocalyptic number.

It is an amenable number.

18685049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18685049 is an equidigital number, since it uses as much as digits as its factorization.

18685049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 18685049 is about 4322.6206171719. The cubic root of 18685049 is about 265.3575285729.

The spelling of 18685049 in words is "eighteen million, six hundred eighty-five thousand, forty-nine".