18109386 has 32 divisors (see below), whose sum is σ = 42612480. Its totient is φ = 5681088.

The previous prime is 18109381. The next prime is 18109387. The reversal of 18109386 is 68390181.

It is a super-2 number, since 2×18109386² = 655899722593992, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18109386.

It is not an unprimeable number, because it can be changed into a prime (18109381) 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 15 ways as a sum of consecutive naturals, for example, 8946 + ... + 10781.

It is an arithmetic number, because the mean of its divisors is an integer number (1331640).

Almost surely, 2^18109386 is an apocalyptic number.

18109386 is an abundant number, since it is smaller than the sum of its proper divisors (24503094).

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

18109386 is a wasteful number, since it uses less digits than its factorization.

18109386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19755 (or 19749 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18109386 is about 4255.5124250788. The cubic root of 18109386 is about 262.6039425098.

The spelling of 18109386 in words is "eighteen million, one hundred nine thousand, three hundred eighty-six".