18742523 has 2 divisors, whose sum is σ = 18742524. Its totient is φ = 18742522.

The previous prime is 18742501. The next prime is 18742541. The reversal of 18742523 is 32524781.

It is a strong prime.

It is an emirp because it is prime and its reverse (32524781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18742523 - 2⁶ = 18742459 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18742523.

It is not a weakly prime, because it can be changed into another prime (18742543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371261 + 9371262.

It is an arithmetic number, because the mean of its divisors is an integer number (9371262).

Almost surely, 2^18742523 is an apocalyptic number.

18742523 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742523 is an equidigital number, since it uses as much as digits as its factorization.

18742523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 18742523 is about 4329.2635632403. The cubic root of 18742523 is about 265.6293242756.

The spelling of 18742523 in words is "eighteen million, seven hundred forty-two thousand, five hundred twenty-three".