18196866 has 32 divisors (see below), whose sum is σ = 41428800. Its totient is φ = 5916960.

The previous prime is 18196853. The next prime is 18196877. The reversal of 18196866 is 66869181.

It is a happy number.

It is a super-2 number, since 2×18196866² = 662251864443912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1896 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (1294650).

Almost surely, 2^18196866 is an apocalyptic number.

18196866 is an abundant number, since it is smaller than the sum of its proper divisors (23231934).

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

18196866 is a wasteful number, since it uses less digits than its factorization.

18196866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271 (or 8265 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 18196866 is about 4265.7784752610. The cubic root of 18196866 is about 263.0261121890.

The spelling of 18196866 in words is "eighteen million, one hundred ninety-six thousand, eight hundred sixty-six".