18369361 has 4 divisors (see below), whose sum is σ = 18400932. Its totient is φ = 18337792.

The previous prime is 18369359. The next prime is 18369389. The reversal of 18369361 is 16396381.

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 16321600 + 2047761 = 4040^2 + 1431^2 .

It is a cyclic number.

It is not a de Polignac number, because 18369361 - 2¹ = 18369359 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 18369361.

It is not an unprimeable number, because it can be changed into a prime (18369331) 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, 14896 + ... + 16081.

It is an arithmetic number, because the mean of its divisors is an integer number (4600233).

Almost surely, 2^18369361 is an apocalyptic number.

It is an amenable number.

18369361 is a deficient number, since it is larger than the sum of its proper divisors (31571).

18369361 is an equidigital number, since it uses as much as digits as its factorization.

18369361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31570.

The product of its digits is 23328, while the sum is 37.

The square root of 18369361 is about 4285.9492530827. The cubic root of 18369361 is about 263.8546079215.

The spelling of 18369361 in words is "eighteen million, three hundred sixty-nine thousand, three hundred sixty-one".