18742489 has 4 divisors (see below), whose sum is σ = 18751156. Its totient is φ = 18733824.

The previous prime is 18742487. The next prime is 18742501. The reversal of 18742489 is 98424781.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 80089 + 18662400 = 283^2 + 4320^2 .

It is a cyclic number.

It is not a de Polignac number, because 18742489 - 2¹ = 18742487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18742487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1897 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (4687789).

Almost surely, 2^18742489 is an apocalyptic number.

It is an amenable number.

18742489 is a deficient number, since it is larger than the sum of its proper divisors (8667).

18742489 is an equidigital number, since it uses as much as digits as its factorization.

18742489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8666.

The product of its digits is 129024, while the sum is 43.

The square root of 18742489 is about 4329.2596364737. The cubic root of 18742489 is about 265.6291636533.

The spelling of 18742489 in words is "eighteen million, seven hundred forty-two thousand, four hundred eighty-nine".