18121386 has 8 divisors (see below), whose sum is σ = 36242784. Its totient is φ = 6040460.

The previous prime is 18121351. The next prime is 18121387. The reversal of 18121386 is 68312181.

It is a sphenic number, since it is the product of 3 distinct primes.

18121386 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18121387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510110 + ... + 1510121.

It is an arithmetic number, because the mean of its divisors is an integer number (4530348).

Almost surely, 2^18121386 is an apocalyptic number.

18121386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18121386 is a wasteful number, since it uses less digits than its factorization.

18121386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020236.

The product of its digits is 2304, while the sum is 30.

The square root of 18121386 is about 4256.9221275471. The cubic root of 18121386 is about 262.6619336443.

The spelling of 18121386 in words is "eighteen million, one hundred twenty-one thousand, three hundred eighty-six".