18227321 has 8 divisors (see below), whose sum is σ = 20941824. Its totient is φ = 15540480.

The previous prime is 18227317. The next prime is 18227323. The reversal of 18227321 is 12372281.

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

It is a cyclic number.

It is not a de Polignac number, because 18227321 - 2² = 18227317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18227323) 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, 5480 + ... + 8153.

It is an arithmetic number, because the mean of its divisors is an integer number (2617728).

Almost surely, 2^18227321 is an apocalyptic number.

It is an amenable number.

18227321 is a deficient number, since it is larger than the sum of its proper divisors (2714503).

18227321 is a wasteful number, since it uses less digits than its factorization.

18227321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13831.

The product of its digits is 1344, while the sum is 26.

The square root of 18227321 is about 4269.3466713304. The cubic root of 18227321 is about 263.1727673973.

The spelling of 18227321 in words is "eighteen million, two hundred twenty-seven thousand, three hundred twenty-one".