18001205 has 8 divisors (see below), whose sum is σ = 21624504. Its totient is φ = 14385600.

The previous prime is 18001201. The next prime is 18001213. The reversal of 18001205 is 50210081.

It can be written as a sum of positive squares in 4 ways, for example, as 4990756 + 13010449 = 2234^2 + 3607^2 .

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

It is not a de Polignac number, because 18001205 - 2² = 18001201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18001201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6995 + ... + 9215.

It is an arithmetic number, because the mean of its divisors is an integer number (2703063).

Almost surely, 2^18001205 is an apocalyptic number.

It is an amenable number.

18001205 is a deficient number, since it is larger than the sum of its proper divisors (3623299).

18001205 is a wasteful number, since it uses less digits than its factorization.

18001205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 18001205 is about 4242.7826953545. The cubic root of 18001205 is about 262.0799874263.

Adding to 18001205 its reverse (50210081), we get a palindrome (68211286).

The spelling of 18001205 in words is "eighteen million, one thousand, two hundred five".