18485869 has 2 divisors, whose sum is σ = 18485870. Its totient is φ = 18485868.

The previous prime is 18485837. The next prime is 18485881. The reversal of 18485869 is 96858481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 7496644 = 3315^2 + 2738^2 .

It is a cyclic number.

It is not a de Polignac number, because 18485869 - 2⁵ = 18485837 is a prime.

It is a super-2 number, since 2×18485869² = 683454705370322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18485809) 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, 9242934 + 9242935.

It is an arithmetic number, because the mean of its divisors is an integer number (9242935).

Almost surely, 2^18485869 is an apocalyptic number.

It is an amenable number.

18485869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18485869 is an equidigital number, since it uses as much as digits as its factorization.

18485869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 49.

The square root of 18485869 is about 4299.5196243301. The cubic root of 18485869 is about 264.4112668886.

The spelling of 18485869 in words is "eighteen million, four hundred eighty-five thousand, eight hundred sixty-nine".