18163138 has 8 divisors (see below), whose sum is σ = 31136832. Its totient is φ = 7784196.

The previous prime is 18163121. The next prime is 18163141. The reversal of 18163138 is 83136181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648670 + ... + 648697.

It is an arithmetic number, because the mean of its divisors is an integer number (3892104).

Almost surely, 2^18163138 is an apocalyptic number.

18163138 is a deficient number, since it is larger than the sum of its proper divisors (12973694).

18163138 is a wasteful number, since it uses less digits than its factorization.

18163138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297376.

The product of its digits is 3456, while the sum is 31.

The square root of 18163138 is about 4261.8233187217. The cubic root of 18163138 is about 262.8635048588.

The spelling of 18163138 in words is "eighteen million, one hundred sixty-three thousand, one hundred thirty-eight".