18806737 has 2 divisors, whose sum is σ = 18806738. Its totient is φ = 18806736.

The previous prime is 18806731. The next prime is 18806747. The reversal of 18806737 is 73760881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17943696 + 863041 = 4236^2 + 929^2 .

It is an emirp because it is prime and its reverse (73760881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18806737 - 2¹⁵ = 18773969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18806737.

It is not a weakly prime, because it can be changed into another prime (18806731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9403368 + 9403369.

It is an arithmetic number, because the mean of its divisors is an integer number (9403369).

Almost surely, 2^18806737 is an apocalyptic number.

It is an amenable number.

18806737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18806737 is an equidigital number, since it uses as much as digits as its factorization.

18806737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 18806737 is about 4336.6734947423. The cubic root of 18806737 is about 265.9323371722.

The spelling of 18806737 in words is "eighteen million, eight hundred six thousand, seven hundred thirty-seven".