18742849 has 2 divisors, whose sum is σ = 18742850. Its totient is φ = 18742848.

The previous prime is 18742847. The next prime is 18742901. The reversal of 18742849 is 94824781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 2582449 = 4020^2 + 1607^2 .

It is an emirp because it is prime and its reverse (94824781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18742849 - 2¹ = 18742847 is a prime.

Together with 18742847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18742847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371424 + 9371425.

It is an arithmetic number, because the mean of its divisors is an integer number (9371425).

Almost surely, 2^18742849 is an apocalyptic number.

It is an amenable number.

18742849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742849 is an equidigital number, since it uses as much as digits as its factorization.

18742849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 18742849 is about 4329.3012138219. The cubic root of 18742849 is about 265.6308643503.

It can be divided in two parts, 18742 and 849, that added together give a palindrome (19591).

The spelling of 18742849 in words is "eighteen million, seven hundred forty-two thousand, eight hundred forty-nine".