18197226 has 12 divisors (see below), whose sum is σ = 39427362. Its totient is φ = 6065736.

The previous prime is 18197219. The next prime is 18197227. The reversal of 18197226 is 62279181.

It can be written as a sum of positive squares in only one way, i.e., 15992001 + 2205225 = 3999^2 + 1485^2 .

It is a super-2 number, since 2×18197226² = 662278068190152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18197227) 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 5 ways as a sum of consecutive naturals, for example, 505461 + ... + 505496.

Almost surely, 2^18197226 is an apocalyptic number.

18197226 is an abundant number, since it is smaller than the sum of its proper divisors (21230136).

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

18197226 is a wasteful number, since it uses less digits than its factorization.

18197226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010965 (or 1010962 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 18197226 is about 4265.8206713363. The cubic root of 18197226 is about 263.0278467144.

It can be divided in two parts, 1819 and 7226, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 18197226 in words is "eighteen million, one hundred ninety-seven thousand, two hundred twenty-six".