18846221 has 4 divisors (see below), whose sum is σ = 18929472. Its totient is φ = 18762972.

The previous prime is 18846211. The next prime is 18846239. The reversal of 18846221 is 12264881.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18846221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18846211) 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, 41285 + ... + 41738.

It is an arithmetic number, because the mean of its divisors is an integer number (4732368).

Almost surely, 2^18846221 is an apocalyptic number.

It is an amenable number.

18846221 is a deficient number, since it is larger than the sum of its proper divisors (83251).

18846221 is an equidigital number, since it uses as much as digits as its factorization.

18846221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83250.

The product of its digits is 6144, while the sum is 32.

The square root of 18846221 is about 4341.2234450671. The cubic root of 18846221 is about 266.1183118896.

The spelling of 18846221 in words is "eighteen million, eight hundred forty-six thousand, two hundred twenty-one".