18003138 has 8 divisors (see below), whose sum is σ = 36006288. Its totient is φ = 6001044.

The previous prime is 18003137. The next prime is 18003163. The reversal of 18003138 is 83130081.

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

18003138 is an admirable number.

It is a super-2 number, since 2×18003138² = 648225955694088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18003131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500256 + ... + 1500267.

It is an arithmetic number, because the mean of its divisors is an integer number (4500786).

Almost surely, 2^18003138 is an apocalyptic number.

18003138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18003138 is a wasteful number, since it uses less digits than its factorization.

18003138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000528.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18003138 is about 4243.0104878494. The cubic root of 18003138 is about 262.0893679554.

The spelling of 18003138 in words is "eighteen million, three thousand, one hundred thirty-eight".