18729122 has 8 divisors (see below), whose sum is σ = 28118172. Its totient is φ = 9356400.

The previous prime is 18729119. The next prime is 18729163. The reversal of 18729122 is 22192781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18671041 + 58081 = 4321^2 + 241^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 629 + ... + 6152.

Almost surely, 2^18729122 is an apocalyptic number.

18729122 is a deficient number, since it is larger than the sum of its proper divisors (9389050).

18729122 is a wasteful number, since it uses less digits than its factorization.

18729122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8164.

The product of its digits is 4032, while the sum is 32.

The square root of 18729122 is about 4327.7155636664. The cubic root of 18729122 is about 265.5660004049.

The spelling of 18729122 in words is "eighteen million, seven hundred twenty-nine thousand, one hundred twenty-two".