12018361 has 4 divisors (see below), whose sum is σ = 12040272. Its totient is φ = 11996452.

The previous prime is 12018353. The next prime is 12018401. The reversal of 12018361 is 16381021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16381021 = 19 ⋅862159.

It is a cyclic number.

It is not a de Polignac number, because 12018361 - 2³ = 12018353 is a prime.

It is a super-2 number, since 2×12018361² = 288882002252642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12018301) 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, 10111 + ... + 11236.

It is an arithmetic number, because the mean of its divisors is an integer number (3010068).

Almost surely, 2^12018361 is an apocalyptic number.

It is an amenable number.

12018361 is a deficient number, since it is larger than the sum of its proper divisors (21911).

12018361 is an equidigital number, since it uses as much as digits as its factorization.

12018361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21910.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 12018361 is about 3466.7507842359. The cubic root of 12018361 is about 229.0595562190.

Adding to 12018361 its reverse (16381021), we get a palindrome (28399382).

It can be divided in two parts, 120 and 18361, that added together give a palindrome (18481).

The spelling of 12018361 in words is "twelve million, eighteen thousand, three hundred sixty-one".