18884138 has 64 divisors (see below), whose sum is σ = 37847040. Its totient is φ = 6858432.

The previous prime is 18884137. The next prime is 18884147. The reversal of 18884138 is 83148881.

It is a super-2 number, since 2×18884138² = 713221336006088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18884095 and 18884104.

It is not an unprimeable number, because it can be changed into a prime (18884137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148631 + ... + 148757.

It is an arithmetic number, because the mean of its divisors is an integer number (591360).

Almost surely, 2^18884138 is an apocalyptic number.

18884138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

18884138 is a wasteful number, since it uses less digits than its factorization.

18884138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211.

The product of its digits is 49152, while the sum is 41.

The square root of 18884138 is about 4345.5883376132. The cubic root of 18884138 is about 266.2966615009.

The spelling of 18884138 in words is "eighteen million, eight hundred eighty-four thousand, one hundred thirty-eight".