18827321 has 2 divisors, whose sum is σ = 18827322. Its totient is φ = 18827320.

The previous prime is 18827311. The next prime is 18827353. The reversal of 18827321 is 12372881.

It is an a-pointer prime, because the next prime (18827353) can be obtained adding 18827321 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18826921 + 400 = 4339^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 18827321 - 2⁶ = 18827257 is a prime.

It is not a weakly prime, because it can be changed into another prime (18827311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9413660 + 9413661.

It is an arithmetic number, because the mean of its divisors is an integer number (9413661).

Almost surely, 2^18827321 is an apocalyptic number.

It is an amenable number.

18827321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18827321 is an equidigital number, since it uses as much as digits as its factorization.

18827321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 18827321 is about 4339.0460933251. The cubic root of 18827321 is about 266.0293229023.

The spelling of 18827321 in words is "eighteen million, eight hundred twenty-seven thousand, three hundred twenty-one".