18889671 has 4 divisors (see below), whose sum is σ = 25186232. Its totient is φ = 12593112.

The previous prime is 18889649. The next prime is 18889679. The reversal of 18889671 is 17698881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17698881 = 3 ⋅5899627.

It is not a de Polignac number, because 18889671 - 2¹⁹ = 18365383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18889671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18889679) 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, 3148276 + ... + 3148281.

It is an arithmetic number, because the mean of its divisors is an integer number (6296558).

Almost surely, 2^18889671 is an apocalyptic number.

18889671 is a deficient number, since it is larger than the sum of its proper divisors (6296561).

18889671 is an equidigital number, since it uses as much as digits as its factorization.

18889671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6296560.

The product of its digits is 193536, while the sum is 48.

The square root of 18889671 is about 4346.2249136463. The cubic root of 18889671 is about 266.3226670220.

The spelling of 18889671 in words is "eighteen million, eight hundred eighty-nine thousand, six hundred seventy-one".