18122487 has 4 divisors (see below), whose sum is σ = 24163320. Its totient is φ = 12081656.

The previous prime is 18122453. The next prime is 18122491. The reversal of 18122487 is 78422181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18122487 - 2¹⁰ = 18121463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122437) 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 3 ways as a sum of consecutive naturals, for example, 3020412 + ... + 3020417.

It is an arithmetic number, because the mean of its divisors is an integer number (6040830).

Almost surely, 2^18122487 is an apocalyptic number.

18122487 is a deficient number, since it is larger than the sum of its proper divisors (6040833).

18122487 is an equidigital number, since it uses as much as digits as its factorization.

18122487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6040832.

The product of its digits is 7168, while the sum is 33.

The square root of 18122487 is about 4257.0514443685. The cubic root of 18122487 is about 262.6672530485.

The spelling of 18122487 in words is "eighteen million, one hundred twenty-two thousand, four hundred eighty-seven".