18012605 has 16 divisors (see below), whose sum is σ = 24648624. Its totient is φ = 12518400.

The previous prime is 18012583. The next prime is 18012613. The reversal of 18012605 is 50621081.

It can be written as a sum of positive squares in 8 ways, for example, as 85849 + 17926756 = 293^2 + 4234^2 .

It is not a de Polignac number, because 18012605 - 2⁶ = 18012541 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7046 + ... + 9255.

It is an arithmetic number, because the mean of its divisors is an integer number (1540539).

Almost surely, 2^18012605 is an apocalyptic number.

It is an amenable number.

18012605 is a deficient number, since it is larger than the sum of its proper divisors (6636019).

18012605 is a wasteful number, since it uses less digits than its factorization.

18012605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16336.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 18012605 is about 4244.1259406384. The cubic root of 18012605 is about 262.1353000453.

Adding to 18012605 its reverse (50621081), we get a palindrome (68633686).

The spelling of 18012605 in words is "eighteen million, twelve thousand, six hundred five".