18722086 has 8 divisors (see below), whose sum is σ = 28304640. Its totient is φ = 9287208.

The previous prime is 18722051. The next prime is 18722089. The reversal of 18722086 is 68022781.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18722089) 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 3 ways as a sum of consecutive naturals, for example, 36601 + ... + 37108.

It is an arithmetic number, because the mean of its divisors is an integer number (3538080).

Almost surely, 2^18722086 is an apocalyptic number.

18722086 is a deficient number, since it is larger than the sum of its proper divisors (9582554).

18722086 is a wasteful number, since it uses less digits than its factorization.

18722086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73838.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 18722086 is about 4326.9025873019. The cubic root of 18722086 is about 265.5327410346.

The spelling of 18722086 in words is "eighteen million, seven hundred twenty-two thousand, eighty-six".