18138827 has 4 divisors (see below), whose sum is σ = 20730096. Its totient is φ = 15547560.

The previous prime is 18138797. The next prime is 18138829. The reversal of 18138827 is 72883181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18138827 - 2¹² = 18134731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18138829) 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, 1295624 + ... + 1295637.

It is an arithmetic number, because the mean of its divisors is an integer number (5182524).

Almost surely, 2^18138827 is an apocalyptic number.

18138827 is a deficient number, since it is larger than the sum of its proper divisors (2591269).

18138827 is an equidigital number, since it uses as much as digits as its factorization.

18138827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591268.

The product of its digits is 21504, while the sum is 38.

The square root of 18138827 is about 4258.9701806892. The cubic root of 18138827 is about 262.7461732986.

The spelling of 18138827 in words is "eighteen million, one hundred thirty-eight thousand, eight hundred twenty-seven".