18006361 has 4 divisors (see below), whose sum is σ = 18627300. Its totient is φ = 17385424.

The previous prime is 18006353. The next prime is 18006371. The reversal of 18006361 is 16360081.

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 13249600 + 4756761 = 3640^2 + 2181^2 .

It is a cyclic number.

It is not a de Polignac number, because 18006361 - 2³ = 18006353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18006371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310426 + ... + 310483.

It is an arithmetic number, because the mean of its divisors is an integer number (4656825).

Almost surely, 2^18006361 is an apocalyptic number.

It is an amenable number.

18006361 is a deficient number, since it is larger than the sum of its proper divisors (620939).

18006361 is an equidigital number, since it uses as much as digits as its factorization.

18006361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620938.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 18006361 is about 4243.3902719406. The cubic root of 18006361 is about 262.1050071481.

The spelling of 18006361 in words is "eighteen million, six thousand, three hundred sixty-one".