18138834 has 48 divisors (see below), whose sum is σ = 45152640. Its totient is φ = 5155200.

The previous prime is 18138829. The next prime is 18138853. The reversal of 18138834 is 43883181.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45034 + ... + 45434.

It is an arithmetic number, because the mean of its divisors is an integer number (940680).

Almost surely, 2^18138834 is an apocalyptic number.

18138834 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18138834 is an abundant number, since it is smaller than the sum of its proper divisors (27013806).

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

18138834 is a wasteful number, since it uses less digits than its factorization.

18138834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775 (or 772 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18138834 is about 4258.9710024841. The cubic root of 18138834 is about 262.7462070976.

The spelling of 18138834 in words is "eighteen million, one hundred thirty-eight thousand, eight hundred thirty-four".