18942859 has 4 divisors (see below), whose sum is σ = 20400016. Its totient is φ = 17485704.

The previous prime is 18942851. The next prime is 18942883. The reversal of 18942859 is 95824981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95824981 = 7 ⋅13689283.

It is a cyclic number.

It is not a de Polignac number, because 18942859 - 2³ = 18942851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18942851) 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, 728559 + ... + 728584.

It is an arithmetic number, because the mean of its divisors is an integer number (5100004).

Almost surely, 2^18942859 is an apocalyptic number.

18942859 is a deficient number, since it is larger than the sum of its proper divisors (1457157).

18942859 is a wasteful number, since it uses less digits than its factorization.

18942859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457156.

The product of its digits is 207360, while the sum is 46.

The square root of 18942859 is about 4352.3394858398. The cubic root of 18942859 is about 266.5723960181.

It can be divided in two parts, 1894 and 2859, that added together give a triangular number (4753 = T₉₇).

The spelling of 18942859 in words is "eighteen million, nine hundred forty-two thousand, eight hundred fifty-nine".