18585481 has 4 divisors (see below), whose sum is σ = 18756100. Its totient is φ = 18414864.

The previous prime is 18585467. The next prime is 18585487. The reversal of 18585481 is 18458581.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14137600 + 4447881 = 3760^2 + 2109^2 .

It is a cyclic number.

It is not a de Polignac number, because 18585481 - 2⁷ = 18585353 is a prime.

It is a super-2 number, since 2×18585481² = 690840208002722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18585487) 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 3 ways as a sum of consecutive naturals, for example, 85146 + ... + 85363.

It is an arithmetic number, because the mean of its divisors is an integer number (4689025).

Almost surely, 2^18585481 is an apocalyptic number.

It is an amenable number.

18585481 is a deficient number, since it is larger than the sum of its proper divisors (170619).

18585481 is a wasteful number, since it uses less digits than its factorization.

18585481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170618.

The product of its digits is 51200, while the sum is 40.

The square root of 18585481 is about 4311.0881457006. The cubic root of 18585481 is about 264.8853473409.

The spelling of 18585481 in words is "eighteen million, five hundred eighty-five thousand, four hundred eighty-one".