18218195 has 4 divisors (see below), whose sum is σ = 21861840. Its totient is φ = 14574552.

The previous prime is 18218191. The next prime is 18218209. The reversal of 18218195 is 59181281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59181281 = 2063 ⋅28687.

It is a cyclic number.

It is not a de Polignac number, because 18218195 - 2² = 18218191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18218191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1821815 + ... + 1821824.

It is an arithmetic number, because the mean of its divisors is an integer number (5465460).

Almost surely, 2^18218195 is an apocalyptic number.

18218195 is a deficient number, since it is larger than the sum of its proper divisors (3643645).

18218195 is an equidigital number, since it uses as much as digits as its factorization.

18218195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643644.

The product of its digits is 5760, while the sum is 35.

The square root of 18218195 is about 4268.2777557230. The cubic root of 18218195 is about 263.1288385498.

The spelling of 18218195 in words is "eighteen million, two hundred eighteen thousand, one hundred ninety-five".