18536789 has 2 divisors, whose sum is σ = 18536790. Its totient is φ = 18536788.

The previous prime is 18536779. The next prime is 18536801. The reversal of 18536789 is 98763581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17156164 + 1380625 = 4142^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 18536789 - 2⁴ = 18536773 is a prime.

It is a super-2 number, since 2×18536789² = 687225092861042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18536719) 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, 9268394 + 9268395.

It is an arithmetic number, because the mean of its divisors is an integer number (9268395).

Almost surely, 2^18536789 is an apocalyptic number.

It is an amenable number.

18536789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18536789 is an equidigital number, since it uses as much as digits as its factorization.

18536789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 18536789 is about 4305.4371438914. The cubic root of 18536789 is about 264.6538211408.

The spelling of 18536789 in words is "eighteen million, five hundred thirty-six thousand, seven hundred eighty-nine".