18893864 has 32 divisors (see below), whose sum is σ = 39385440. Its totient is φ = 8424000.

The previous prime is 18893863. The next prime is 18893873. The reversal of 18893864 is 46839881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18893863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2639 + ... + 6689.

It is an arithmetic number, because the mean of its divisors is an integer number (1230795).

Almost surely, 2^18893864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18893864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19692720).

18893864 is an abundant number, since it is smaller than the sum of its proper divisors (20491576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18893864 is a wasteful number, since it uses less digits than its factorization.

18893864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4121 (or 4117 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 18893864 is about 4346.7072595242. The cubic root of 18893864 is about 266.3423710590.

The spelling of 18893864 in words is "eighteen million, eight hundred ninety-three thousand, eight hundred sixty-four".