18196636 has 6 divisors (see below), whose sum is σ = 31844120. Its totient is φ = 9098316.

The previous prime is 18196627. The next prime is 18196639. The reversal of 18196636 is 63669181.

It is a super-2 number, since 2×18196636² = 662235123432992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18196639) 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 as a sum of consecutive naturals, namely, 2274576 + ... + 2274583.

Almost surely, 2^18196636 is an apocalyptic number.

It is an amenable number.

18196636 is a deficient number, since it is larger than the sum of its proper divisors (13647484).

18196636 is a wasteful number, since it uses less digits than its factorization.

18196636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4549163 (or 4549161 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 18196636 is about 4265.7515164388. The cubic root of 18196636 is about 263.0250040081.

The spelling of 18196636 in words is "eighteen million, one hundred ninety-six thousand, six hundred thirty-six".