18813449 has 2 divisors, whose sum is σ = 18813450. Its totient is φ = 18813448.

The previous prime is 18813419. The next prime is 18813451. The reversal of 18813449 is 94431881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13454224 + 5359225 = 3668^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 18813449 - 2¹⁶ = 18747913 is a prime.

Together with 18813451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18813419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9406724 + 9406725.

It is an arithmetic number, because the mean of its divisors is an integer number (9406725).

Almost surely, 2^18813449 is an apocalyptic number.

It is an amenable number.

18813449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18813449 is an equidigital number, since it uses as much as digits as its factorization.

18813449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 18813449 is about 4337.4472907460. The cubic root of 18813449 is about 265.9639699065.

The spelling of 18813449 in words is "eighteen million, eight hundred thirteen thousand, four hundred forty-nine".