18859864 has 8 divisors (see below), whose sum is σ = 35362260. Its totient is φ = 9429928.

The previous prime is 18859861. The next prime is 18859871. The reversal of 18859864 is 46895881.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18859861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1178734 + ... + 1178749.

Almost surely, 2^18859864 is an apocalyptic number.

It is an amenable number.

18859864 is a deficient number, since it is larger than the sum of its proper divisors (16502396).

18859864 is a wasteful number, since it uses less digits than its factorization.

18859864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357489 (or 2357485 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The square root of 18859864 is about 4342.7944920293. The cubic root of 18859864 is about 266.1825117875.

The spelling of 18859864 in words is "eighteen million, eight hundred fifty-nine thousand, eight hundred sixty-four".