18138768 has 40 divisors (see below), whose sum is σ = 49327200. Its totient is φ = 5727744.

The previous prime is 18138767. The next prime is 18138797. The reversal of 18138768 is 86783181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9033 + ... + 10856.

It is an arithmetic number, because the mean of its divisors is an integer number (1233180).

Almost surely, 2^18138768 is an apocalyptic number.

It is an amenable number.

18138768 is an abundant number, since it is smaller than the sum of its proper divisors (31188432).

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

18138768 is a wasteful number, since it uses less digits than its factorization.

18138768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19919 (or 19913 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 18138768 is about 4258.9632541265. The cubic root of 18138768 is about 262.7458884209.

The spelling of 18138768 in words is "eighteen million, one hundred thirty-eight thousand, seven hundred sixty-eight".