18942217 has 8 divisors (see below), whose sum is σ = 21736512. Its totient is φ = 16170000.

The previous prime is 18942211. The next prime is 18942223. The reversal of 18942217 is 71224981.

It is an interprime number because it is at equal distance from previous prime (18942211) and next prime (18942223).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18942217 - 2⁷ = 18942089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18942211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3634 + ... + 7147.

It is an arithmetic number, because the mean of its divisors is an integer number (2717064).

Almost surely, 2^18942217 is an apocalyptic number.

It is an amenable number.

18942217 is a deficient number, since it is larger than the sum of its proper divisors (2794295).

18942217 is a wasteful number, since it uses less digits than its factorization.

18942217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11039.

The product of its digits is 8064, while the sum is 34.

The square root of 18942217 is about 4352.2657317770. The cubic root of 18942217 is about 266.5693844803.

The spelling of 18942217 in words is "eighteen million, nine hundred forty-two thousand, two hundred seventeen".