18908849 has 2 divisors, whose sum is σ = 18908850. Its totient is φ = 18908848.

The previous prime is 18908833. The next prime is 18908861. The reversal of 18908849 is 94880981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 1210000 = 4207^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 18908849 - 2⁴ = 18908833 is a prime.

It is a super-3 number, since 3×18908849³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18904849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9454424 + 9454425.

It is an arithmetic number, because the mean of its divisors is an integer number (9454425).

Almost surely, 2^18908849 is an apocalyptic number.

It is an amenable number.

18908849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18908849 is an equidigital number, since it uses as much as digits as its factorization.

18908849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 18908849 is about 4348.4306364481. The cubic root of 18908849 is about 266.4127657958.

The spelling of 18908849 in words is "eighteen million, nine hundred eight thousand, eight hundred forty-nine".