18505386 has 24 divisors (see below), whose sum is σ = 41839200. Its totient is φ = 5900136.

The previous prime is 18505381. The next prime is 18505397. The reversal of 18505386 is 68350581.

It is a super-2 number, since 2×18505386² = 684898622017992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18505386.

It is not an unprimeable number, because it can be changed into a prime (18505381) 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 in 11 ways as a sum of consecutive naturals, for example, 21936 + ... + 22763.

It is an arithmetic number, because the mean of its divisors is an integer number (1743300).

Almost surely, 2^18505386 is an apocalyptic number.

18505386 is an abundant number, since it is smaller than the sum of its proper divisors (23333814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18505386 is a wasteful number, since it uses less digits than its factorization.

18505386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44730 (or 44727 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 18505386 is about 4301.7886977396. The cubic root of 18505386 is about 264.5042874843.

The spelling of 18505386 in words is "eighteen million, five hundred five thousand, three hundred eighty-six".