18824149 has 2 divisors, whose sum is σ = 18824150. Its totient is φ = 18824148.

The previous prime is 18824147. The next prime is 18824167. The reversal of 18824149 is 94142881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13557124 + 5267025 = 3682^2 + 2295^2 .

It is a cyclic number.

It is not a de Polignac number, because 18824149 - 2¹ = 18824147 is a prime.

Together with 18824147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18824147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9412074 + 9412075.

It is an arithmetic number, because the mean of its divisors is an integer number (9412075).

Almost surely, 2^18824149 is an apocalyptic number.

It is an amenable number.

18824149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18824149 is an equidigital number, since it uses as much as digits as its factorization.

18824149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 37.

The square root of 18824149 is about 4338.6805598016. The cubic root of 18824149 is about 266.0143819838.

The spelling of 18824149 in words is "eighteen million, eight hundred twenty-four thousand, one hundred forty-nine".