18942161 has 8 divisors (see below), whose sum is σ = 21953664. Its totient is φ = 16007040.

The previous prime is 18942149. The next prime is 18942163. The reversal of 18942161 is 16124981.

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

It is not a de Polignac number, because 18942161 - 2¹⁰ = 18941137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18942163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18560 + ... + 19553.

It is an arithmetic number, because the mean of its divisors is an integer number (2744208).

Almost surely, 2^18942161 is an apocalyptic number.

It is an amenable number.

18942161 is a deficient number, since it is larger than the sum of its proper divisors (3011503).

18942161 is an equidigital number, since it uses as much as digits as its factorization.

18942161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38191.

The product of its digits is 3456, while the sum is 32.

The square root of 18942161 is about 4352.2592983415. The cubic root of 18942161 is about 266.5691217884.

The spelling of 18942161 in words is "eighteen million, nine hundred forty-two thousand, one hundred sixty-one".