18706637 has 2 divisors, whose sum is σ = 18706638. Its totient is φ = 18706636.

The previous prime is 18706603. The next prime is 18706651. The reversal of 18706637 is 73660781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15768841 + 2937796 = 3971^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 18706637 - 2⁶ = 18706573 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18706637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18706657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9353318 + 9353319.

It is an arithmetic number, because the mean of its divisors is an integer number (9353319).

Almost surely, 2^18706637 is an apocalyptic number.

It is an amenable number.

18706637 is a deficient number, since it is larger than the sum of its proper divisors (1).

18706637 is an equidigital number, since it uses as much as digits as its factorization.

18706637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 18706637 is about 4325.1169926373. The cubic root of 18706637 is about 265.4596839300.

The spelling of 18706637 in words is "eighteen million, seven hundred six thousand, six hundred thirty-seven".