18888859 has 4 divisors (see below), whose sum is σ = 20606040. Its totient is φ = 17171680.

The previous prime is 18888851. The next prime is 18888871. The reversal of 18888859 is 95888881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95888881 = 11 ⋅8717171.

It is a cyclic number.

It is not a de Polignac number, because 18888859 - 2³ = 18888851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18888851) 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, 858574 + ... + 858595.

It is an arithmetic number, because the mean of its divisors is an integer number (5151510).

Almost surely, 2^18888859 is an apocalyptic number.

18888859 is a deficient number, since it is larger than the sum of its proper divisors (1717181).

18888859 is a wasteful number, since it uses less digits than its factorization.

18888859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717180.

The product of its digits is 1474560, while the sum is 55.

The square root of 18888859 is about 4346.1314982407. The cubic root of 18888859 is about 266.3188508782.

The spelling of 18888859 in words is "eighteen million, eight hundred eighty-eight thousand, eight hundred fifty-nine".