18486169 has 4 divisors (see below), whose sum is σ = 19908196. Its totient is φ = 17064144.

The previous prime is 18486161. The next prime is 18486197. The reversal of 18486169 is 96168481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96168481 = 19 ⋅5061499.

It can be written as a sum of positive squares in 2 ways, for example, as 3763600 + 14722569 = 1940^2 + 3837^2 .

It is a cyclic number.

It is not a de Polignac number, because 18486169 - 2³ = 18486161 is a prime.

It is a super-2 number, since 2×18486169² = 683476888593122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18486161) 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 in 3 ways as a sum of consecutive naturals, for example, 710994 + ... + 711019.

It is an arithmetic number, because the mean of its divisors is an integer number (4977049).

Almost surely, 2^18486169 is an apocalyptic number.

It is an amenable number.

18486169 is a deficient number, since it is larger than the sum of its proper divisors (1422027).

18486169 is a wasteful number, since it uses less digits than its factorization.

18486169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422026.

The product of its digits is 82944, while the sum is 43.

The square root of 18486169 is about 4299.5545118070. The cubic root of 18486169 is about 264.4126972235.

The spelling of 18486169 in words is "eighteen million, four hundred eighty-six thousand, one hundred sixty-nine".