18218145 has 32 divisors (see below), whose sum is σ = 32586624. Its totient is φ = 8614400.

The previous prime is 18218143. The next prime is 18218147. The reversal of 18218145 is 54181281.

18218145 = 11² + 12² + ... + 379².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18218143) and next prime (18218147).

It is not a de Polignac number, because 18218145 - 2¹ = 18218143 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18218143) 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 31 ways as a sum of consecutive naturals, for example, 5419 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (1018332).

Almost surely, 2^18218145 is an apocalyptic number.

18218145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18218145 is a deficient number, since it is larger than the sum of its proper divisors (14368479).

18218145 is a wasteful number, since it uses less digits than its factorization.

18218145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2753.

The product of its digits is 2560, while the sum is 30.

The square root of 18218145 is about 4268.2718985557. The cubic root of 18218145 is about 263.1285978298.

The spelling of 18218145 in words is "eighteen million, two hundred eighteen thousand, one hundred forty-five".