18890161 has 8 divisors (see below), whose sum is σ = 20109600. Its totient is φ = 17693280.

The previous prime is 18890149. The next prime is 18890167. The reversal of 18890161 is 16109881.

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

It is a cyclic number.

It is not a de Polignac number, because 18890161 - 2⁷ = 18890033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18890167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3895 + ... + 7276.

It is an arithmetic number, because the mean of its divisors is an integer number (2513700).

Almost surely, 2^18890161 is an apocalyptic number.

It is an amenable number.

18890161 is a deficient number, since it is larger than the sum of its proper divisors (1219439).

18890161 is a wasteful number, since it uses less digits than its factorization.

18890161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11279.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 18890161 is about 4346.2812840404. The cubic root of 18890161 is about 266.3249698145.

The spelling of 18890161 in words is "eighteen million, eight hundred ninety thousand, one hundred sixty-one".