18195863 has 8 divisors (see below), whose sum is σ = 21889920. Its totient is φ = 14775480.

The previous prime is 18195851. The next prime is 18195869. The reversal of 18195863 is 36859181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18195863 - 2⁶ = 18195799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18195863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195869) 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 7 ways as a sum of consecutive naturals, for example, 68273 + ... + 68538.

It is an arithmetic number, because the mean of its divisors is an integer number (2736240).

Almost surely, 2^18195863 is an apocalyptic number.

18195863 is a deficient number, since it is larger than the sum of its proper divisors (3694057).

18195863 is a wasteful number, since it uses less digits than its factorization.

18195863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136837.

The product of its digits is 51840, while the sum is 41.

The square root of 18195863 is about 4265.6609101053. The cubic root of 18195863 is about 263.0212794880.

The spelling of 18195863 in words is "eighteen million, one hundred ninety-five thousand, eight hundred sixty-three".