18518197 has 16 divisors (see below), whose sum is σ = 20034432. Its totient is φ = 17075520.

The previous prime is 18518161. The next prime is 18518207. The reversal of 18518197 is 79181581.

It is a cyclic number.

It is not a de Polignac number, because 18518197 - 2⁷ = 18518069 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 (18528197) by changing a digit.

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, 93903 + ... + 94099.

It is an arithmetic number, because the mean of its divisors is an integer number (1252152).

Almost surely, 2^18518197 is an apocalyptic number.

It is an amenable number.

18518197 is a deficient number, since it is larger than the sum of its proper divisors (1516235).

18518197 is a wasteful number, since it uses less digits than its factorization.

18518197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348.

The product of its digits is 20160, while the sum is 40.

The square root of 18518197 is about 4303.2774718812. The cubic root of 18518197 is about 264.5653108493.

The spelling of 18518197 in words is "eighteen million, five hundred eighteen thousand, one hundred ninety-seven".