18196668 has 72 divisors (see below), whose sum is σ = 53010048. Its totient is φ = 5155488.

The previous prime is 18196667. The next prime is 18196679. The reversal of 18196668 is 86669181.

It is a happy number.

It is a super-2 number, since 2×18196668² = 662237452604448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18196667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40855 + ... + 41297.

Almost surely, 2^18196668 is an apocalyptic number.

18196668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18196668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26505024).

18196668 is an abundant number, since it is smaller than the sum of its proper divisors (34813380).

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

18196668 is a wasteful number, since it uses less digits than its factorization.

18196668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 618 counting only the distinct ones).

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

The square root of 18196668 is about 4265.7552672417. The cubic root of 18196668 is about 263.0251581903.

The spelling of 18196668 in words is "eighteen million, one hundred ninety-six thousand, six hundred sixty-eight".