18018734 has 4 divisors (see below), whose sum is σ = 27028104. Its totient is φ = 9009366.

The previous prime is 18018701. The next prime is 18018739. The reversal of 18018734 is 43781081.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18018734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018739) 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 as a sum of consecutive naturals, namely, 4504682 + ... + 4504685.

It is an arithmetic number, because the mean of its divisors is an integer number (6757026).

Almost surely, 2^18018734 is an apocalyptic number.

18018734 is a deficient number, since it is larger than the sum of its proper divisors (9009370).

18018734 is an equidigital number, since it uses as much as digits as its factorization.

18018734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9009369.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 18018734 is about 4244.8479360279. The cubic root of 18018734 is about 262.1650282100.

The spelling of 18018734 in words is "eighteen million, eighteen thousand, seven hundred thirty-four".