18538968 has 64 divisors (see below), whose sum is σ = 53372160. Its totient is φ = 5256576.

The previous prime is 18538957. The next prime is 18538969. The reversal of 18538968 is 86983581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27046 + ... + 27722.

It is an arithmetic number, because the mean of its divisors is an integer number (833940).

Almost surely, 2^18538968 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 18538968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26686080).

18538968 is an abundant number, since it is smaller than the sum of its proper divisors (34833192).

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

18538968 is a wasteful number, since it uses less digits than its factorization.

18538968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 852 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 18538968 is about 4305.6901885760. The cubic root of 18538968 is about 264.6641907556.

The spelling of 18538968 in words is "eighteen million, five hundred thirty-eight thousand, nine hundred sixty-eight".