18191768 has 64 divisors (see below), whose sum is σ = 41912640. Its totient is φ = 7225344.

The previous prime is 18191749. The next prime is 18191777. The reversal of 18191768 is 86719181.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 92246 + ... + 92442.

It is an arithmetic number, because the mean of its divisors is an integer number (654885).

Almost surely, 2^18191768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18191768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20956320).

18191768 is an abundant number, since it is smaller than the sum of its proper divisors (23720872).

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

18191768 is a wasteful number, since it uses less digits than its factorization.

18191768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 320 counting only the distinct ones).

The product of its digits is 24192, while the sum is 41.

The square root of 18191768 is about 4265.1808871371. The cubic root of 18191768 is about 263.0015469267.

The spelling of 18191768 in words is "eighteen million, one hundred ninety-one thousand, seven hundred sixty-eight".