18722146 has 8 divisors (see below), whose sum is σ = 28288620. Its totient is φ = 9292608.

The previous prime is 18722113. The next prime is 18722149. The reversal of 18722146 is 64122781.

It can be written as a sum of positive squares in 2 ways, for example, as 16719921 + 2002225 = 4089^2 + 1415^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18722149) 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, 33891 + ... + 34438.

Almost surely, 2^18722146 is an apocalyptic number.

18722146 is a deficient number, since it is larger than the sum of its proper divisors (9566474).

18722146 is a wasteful number, since it uses less digits than its factorization.

18722146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68468.

The product of its digits is 5376, while the sum is 31.

The square root of 18722146 is about 4326.9095206625. The cubic root of 18722146 is about 265.5330246915.

The spelling of 18722146 in words is "eighteen million, seven hundred twenty-two thousand, one hundred forty-six".