18061385 has 4 divisors (see below), whose sum is σ = 21673668. Its totient is φ = 14449104.

The previous prime is 18061367. The next prime is 18061427. The reversal of 18061385 is 58316081.

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 11363641 + 6697744 = 3371^2 + 2588^2 .

It is a cyclic number.

It is not a de Polignac number, because 18061385 - 2¹² = 18057289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806134 + ... + 1806143.

It is an arithmetic number, because the mean of its divisors is an integer number (5418417).

Almost surely, 2^18061385 is an apocalyptic number.

It is an amenable number.

18061385 is a deficient number, since it is larger than the sum of its proper divisors (3612283).

18061385 is an equidigital number, since it uses as much as digits as its factorization.

18061385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612282.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 18061385 is about 4249.8688215050. The cubic root of 18061385 is about 262.3717166078.

The spelling of 18061385 in words is "eighteen million, sixty-one thousand, three hundred eighty-five".