18992163 has 8 divisors (see below), whose sum is σ = 25346128. Its totient is φ = 12649824.

The previous prime is 18992161. The next prime is 18992209. The reversal of 18992163 is 36129981.

It is a Cunningham number, because it is equal to 4358²-1.

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

It is not a de Polignac number, because 18992163 - 2¹ = 18992161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18992161) 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, 2181 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (3168266).

Almost surely, 2^18992163 is an apocalyptic number.

18992163 is a deficient number, since it is larger than the sum of its proper divisors (6353965).

18992163 is a wasteful number, since it uses less digits than its factorization.

18992163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5813.

The product of its digits is 23328, while the sum is 39.

The square root of 18992163 is about 4357.9998852685. Note that the first 3 decimals coincide. The cubic root of 18992163 is about 266.8034716448.

The spelling of 18992163 in words is "eighteen million, nine hundred ninety-two thousand, one hundred sixty-three".