18550373 has 2 divisors, whose sum is σ = 18550374. Its totient is φ = 18550372.

The previous prime is 18550333. The next prime is 18550381. The reversal of 18550373 is 37305581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16826404 + 1723969 = 4102^2 + 1313^2 .

It is an emirp because it is prime and its reverse (37305581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18550373 - 2⁶ = 18550309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18550303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9275186 + 9275187.

It is an arithmetic number, because the mean of its divisors is an integer number (9275187).

Almost surely, 2^18550373 is an apocalyptic number.

It is an amenable number.

18550373 is a deficient number, since it is larger than the sum of its proper divisors (1).

18550373 is an equidigital number, since it uses as much as digits as its factorization.

18550373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 18550373 is about 4307.0143951466. The cubic root of 18550373 is about 264.7184526095.

The spelling of 18550373 in words is "eighteen million, five hundred fifty thousand, three hundred seventy-three".