11685618 has 36 divisors (see below), whose sum is σ = 29454750. Its totient is φ = 3338496.

The previous prime is 11685617. The next prime is 11685643. The reversal of 11685618 is 81658611.

It can be written as a sum of positive squares in only one way, i.e., 10870209 + 815409 = 3297^2 + 903^2 .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11685617) 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 17 ways as a sum of consecutive naturals, for example, 5743 + ... + 7506.

Almost surely, 2^11685618 is an apocalyptic number.

11685618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11685618 is an abundant number, since it is smaller than the sum of its proper divisors (17769132).

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

11685618 is a wasteful number, since it uses less digits than its factorization.

11685618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13271 (or 13261 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 11685618 is about 3418.4233207723. The cubic root of 11685618 is about 226.9258103988.

It can be divided in two parts, 1168 and 5618, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 11685618 in words is "eleven million, six hundred eighty-five thousand, six hundred eighteen".