18997185 has 16 divisors (see below), whose sum is σ = 31103424. Its totient is φ = 9895872.

The previous prime is 18997171. The next prime is 18997193. The reversal of 18997185 is 58179981.

It is not a de Polignac number, because 18997185 - 2¹² = 18993089 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 14082 + ... + 15371.

It is an arithmetic number, because the mean of its divisors is an integer number (1943964).

Almost surely, 2^18997185 is an apocalyptic number.

18997185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18997185 is a deficient number, since it is larger than the sum of its proper divisors (12106239).

18997185 is a wasteful number, since it uses less digits than its factorization.

18997185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29504.

The product of its digits is 181440, while the sum is 48.

The square root of 18997185 is about 4358.5760289342. The cubic root of 18997185 is about 266.8269860623.

The spelling of 18997185 in words is "eighteen million, nine hundred ninety-seven thousand, one hundred eighty-five".