18742117 has 4 divisors (see below), whose sum is σ = 19059840. Its totient is φ = 18424396.

The previous prime is 18742099. The next prime is 18742121. The reversal of 18742117 is 71124781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18742117 - 2¹⁵ = 18709349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18742187) 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, 158773 + ... + 158890.

It is an arithmetic number, because the mean of its divisors is an integer number (4764960).

Almost surely, 2^18742117 is an apocalyptic number.

It is an amenable number.

18742117 is a deficient number, since it is larger than the sum of its proper divisors (317723).

18742117 is an equidigital number, since it uses as much as digits as its factorization.

18742117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317722.

The product of its digits is 3136, while the sum is 31.

The square root of 18742117 is about 4329.2166727943. The cubic root of 18742117 is about 265.6274062435.

Adding to 18742117 its reverse (71124781), we get a palindrome (89866898).

The spelling of 18742117 in words is "eighteen million, seven hundred forty-two thousand, one hundred seventeen".