18937873 has 2 divisors, whose sum is σ = 18937874. Its totient is φ = 18937872.

The previous prime is 18937871. The next prime is 18937913. The reversal of 18937873 is 37873981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18378369 + 559504 = 4287^2 + 748^2 .

It is an emirp because it is prime and its reverse (37873981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18937873 - 2¹ = 18937871 is a prime.

Together with 18937871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18937871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9468936 + 9468937.

It is an arithmetic number, because the mean of its divisors is an integer number (9468937).

Almost surely, 2^18937873 is an apocalyptic number.

It is an amenable number.

18937873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18937873 is an equidigital number, since it uses as much as digits as its factorization.

18937873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 18937873 is about 4351.7666527515. The cubic root of 18937873 is about 266.5490055574.

The spelling of 18937873 in words is "eighteen million, nine hundred thirty-seven thousand, eight hundred seventy-three".