18385427 has 4 divisors (see below), whose sum is σ = 18417336. Its totient is φ = 18353520.

The previous prime is 18385421. The next prime is 18385429. The reversal of 18385427 is 72458381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72458381 = 19 ⋅3813599.

It is a cyclic number.

It is not a de Polignac number, because 18385427 - 2⁶ = 18385363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18385421) 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, 15074 + ... + 16247.

It is an arithmetic number, because the mean of its divisors is an integer number (4604334).

Almost surely, 2^18385427 is an apocalyptic number.

18385427 is a deficient number, since it is larger than the sum of its proper divisors (31909).

18385427 is an equidigital number, since it uses as much as digits as its factorization.

18385427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31908.

The product of its digits is 53760, while the sum is 38.

The square root of 18385427 is about 4287.8231073588. The cubic root of 18385427 is about 263.9315086710.

The spelling of 18385427 in words is "eighteen million, three hundred eighty-five thousand, four hundred twenty-seven".