18147745 has 16 divisors (see below), whose sum is σ = 27151488. Its totient is φ = 11312640.

The previous prime is 18147743. The next prime is 18147749. The reversal of 18147745 is 54774181.

It is not a de Polignac number, because 18147745 - 2¹ = 18147743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18147743) 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 in 15 ways as a sum of consecutive naturals, for example, 23184 + ... + 23953.

It is an arithmetic number, because the mean of its divisors is an integer number (1696968).

Almost surely, 2^18147745 is an apocalyptic number.

It is an amenable number.

18147745 is a deficient number, since it is larger than the sum of its proper divisors (9003743).

18147745 is a wasteful number, since it uses less digits than its factorization.

18147745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47160.

The product of its digits is 31360, while the sum is 37.

The square root of 18147745 is about 4260.0170187453. The cubic root of 18147745 is about 262.7892261830.

It can be divided in two parts, 1814 and 7745, that added together give a palindrome (9559).

The spelling of 18147745 in words is "eighteen million, one hundred forty-seven thousand, seven hundred forty-five".