18213197 has 8 divisors (see below), whose sum is σ = 18665472. Its totient is φ = 17766000.

The previous prime is 18213193. The next prime is 18213199. The reversal of 18213197 is 79131281.

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 18213197 - 2² = 18213193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213193) 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, 6572 + ... + 8922.

It is an arithmetic number, because the mean of its divisors is an integer number (2333184).

Almost surely, 2^18213197 is an apocalyptic number.

It is an amenable number.

18213197 is a deficient number, since it is larger than the sum of its proper divisors (452275).

18213197 is a wasteful number, since it uses less digits than its factorization.

18213197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539.

The product of its digits is 3024, while the sum is 32.

The square root of 18213197 is about 4267.6922335145. The cubic root of 18213197 is about 263.1047739957.

The spelling of 18213197 in words is "eighteen million, two hundred thirteen thousand, one hundred ninety-seven".