18081205 has 16 divisors (see below), whose sum is σ = 22390704. Its totient is φ = 14008320.

The previous prime is 18081187. The next prime is 18081209. The reversal of 18081205 is 50218081.

It can be written as a sum of positive squares in 8 ways, for example, as 1418481 + 16662724 = 1191^2 + 4082^2 .

It is not a de Polignac number, because 18081205 - 2¹⁷ = 17950133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18081205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39337 + ... + 39793.

It is an arithmetic number, because the mean of its divisors is an integer number (1399419).

Almost surely, 2^18081205 is an apocalyptic number.

It is an amenable number.

18081205 is a deficient number, since it is larger than the sum of its proper divisors (4309499).

18081205 is a wasteful number, since it uses less digits than its factorization.

18081205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 18081205 is about 4252.2000188138. The cubic root of 18081205 is about 262.4676543667.

Adding to 18081205 its reverse (50218081), we get a palindrome (68299286).

The spelling of 18081205 in words is "eighteen million, eighty-one thousand, two hundred five".