18120897 has 12 divisors (see below), whose sum is σ = 26732160. Its totient is φ = 11823288.

The previous prime is 18120871. The next prime is 18120899. The reversal of 18120897 is 79802181.

It is not a de Polignac number, because 18120897 - 2⁷ = 18120769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18120899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20997 + ... + 21842.

It is an arithmetic number, because the mean of its divisors is an integer number (2227680).

Almost surely, 2^18120897 is an apocalyptic number.

It is an amenable number.

18120897 is a deficient number, since it is larger than the sum of its proper divisors (8611263).

18120897 is a wasteful number, since it uses less digits than its factorization.

18120897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42892 (or 42889 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 18120897 is about 4256.8646912957. The cubic root of 18120897 is about 262.6595710060.

The spelling of 18120897 in words is "eighteen million, one hundred twenty thousand, eight hundred ninety-seven".