18972226 has 16 divisors (see below), whose sum is σ = 35025984. Its totient is φ = 7505424.

The previous prime is 18972199. The next prime is 18972229. The reversal of 18972226 is 62227981.

It is not an unprimeable number, because it can be changed into a prime (18972229) 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 7 ways as a sum of consecutive naturals, for example, 51940 + ... + 52303.

It is an arithmetic number, because the mean of its divisors is an integer number (2189124).

Almost surely, 2^18972226 is an apocalyptic number.

18972226 is a deficient number, since it is larger than the sum of its proper divisors (16053758).

18972226 is a wasteful number, since it uses less digits than its factorization.

18972226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104265.

The product of its digits is 24192, while the sum is 37.

The square root of 18972226 is about 4355.7118821153. The cubic root of 18972226 is about 266.7100800847.

The spelling of 18972226 in words is "eighteen million, nine hundred seventy-two thousand, two hundred twenty-six".