18739541 has 2 divisors, whose sum is σ = 18739542. Its totient is φ = 18739540.

The previous prime is 18739519. The next prime is 18739547. The reversal of 18739541 is 14593781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10588516 + 8151025 = 3254^2 + 2855^2 .

It is an emirp because it is prime and its reverse (14593781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18739541 - 2⁶ = 18739477 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18739495 and 18739504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18739547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369770 + 9369771.

It is an arithmetic number, because the mean of its divisors is an integer number (9369771).

Almost surely, 2^18739541 is an apocalyptic number.

It is an amenable number.

18739541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18739541 is an equidigital number, since it uses as much as digits as its factorization.

18739541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 18739541 is about 4328.9191491641. The cubic root of 18739541 is about 265.6152360148.

Subtracting from 18739541 its reverse (14593781), we obtain a triangular number (4145760 = T₂₈₇₉).

The spelling of 18739541 in words is "eighteen million, seven hundred thirty-nine thousand, five hundred forty-one".