18719368 has 8 divisors (see below), whose sum is σ = 35098830. Its totient is φ = 9359680.

The previous prime is 18719359. The next prime is 18719369. The reversal of 18719368 is 86391781.

It can be written as a sum of positive squares in only one way, i.e., 17322244 + 1397124 = 4162^2 + 1182^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18719369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1169953 + ... + 1169968.

Almost surely, 2^18719368 is an apocalyptic number.

It is an amenable number.

18719368 is a deficient number, since it is larger than the sum of its proper divisors (16379462).

18719368 is a wasteful number, since it uses less digits than its factorization.

18719368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339927 (or 2339923 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 18719368 is about 4326.5884944145. The cubic root of 18719368 is about 265.5198907407.

The spelling of 18719368 in words is "eighteen million, seven hundred nineteen thousand, three hundred sixty-eight".