18783641 has 2 divisors, whose sum is σ = 18783642. Its totient is φ = 18783640.

The previous prime is 18783607. The next prime is 18783671. The reversal of 18783641 is 14638781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17606416 + 1177225 = 4196^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 18783641 - 2⁶ = 18783577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18783595 and 18783604.

It is not a weakly prime, because it can be changed into another prime (18783671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9391820 + 9391821.

It is an arithmetic number, because the mean of its divisors is an integer number (9391821).

Almost surely, 2^18783641 is an apocalyptic number.

It is an amenable number.

18783641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18783641 is an equidigital number, since it uses as much as digits as its factorization.

18783641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 18783641 is about 4334.0098061726. The cubic root of 18783641 is about 265.8234313541.

The spelling of 18783641 in words is "eighteen million, seven hundred eighty-three thousand, six hundred forty-one".