18127918 has 4 divisors (see below), whose sum is σ = 27191880. Its totient is φ = 9063958.

The previous prime is 18127913. The next prime is 18127931. The reversal of 18127918 is 81972181.

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

It is a super-2 number, since 2×18127918² = 657242822029448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18127913) 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 as a sum of consecutive naturals, namely, 4531978 + ... + 4531981.

It is an arithmetic number, because the mean of its divisors is an integer number (6797970).

Almost surely, 2^18127918 is an apocalyptic number.

18127918 is a deficient number, since it is larger than the sum of its proper divisors (9063962).

18127918 is an equidigital number, since it uses as much as digits as its factorization.

18127918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9063961.

The product of its digits is 8064, while the sum is 37.

The square root of 18127918 is about 4257.6892794097. The cubic root of 18127918 is about 262.6934893918.

It can be divided in two parts, 1812 and 7918, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 18127918 in words is "eighteen million, one hundred twenty-seven thousand, nine hundred eighteen".