18218485 has 8 divisors (see below), whose sum is σ = 22275000. Its totient is φ = 14299584.

The previous prime is 18218479. The next prime is 18218489. The reversal of 18218485 is 58481281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 628849 + 17589636 = 793^2 + 4194^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18218485 - 2³ = 18218477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34110 + ... + 34639.

It is an arithmetic number, because the mean of its divisors is an integer number (2784375).

Almost surely, 2^18218485 is an apocalyptic number.

It is an amenable number.

18218485 is a deficient number, since it is larger than the sum of its proper divisors (4056515).

18218485 is an equidigital number, since it uses as much as digits as its factorization.

18218485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68807.

The product of its digits is 20480, while the sum is 37.

The square root of 18218485 is about 4268.3117271352. The cubic root of 18218485 is about 263.1302347174.

The spelling of 18218485 in words is "eighteen million, two hundred eighteen thousand, four hundred eighty-five".