18189232 has 20 divisors (see below), whose sum is σ = 37097080. Its totient is φ = 8615808.

The previous prime is 18189221. The next prime is 18189239. The reversal of 18189232 is 23298181.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18189239) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 29613 + ... + 30220.

It is an arithmetic number, because the mean of its divisors is an integer number (1854854).

Almost surely, 2^18189232 is an apocalyptic number.

It is an amenable number.

18189232 is an abundant number, since it is smaller than the sum of its proper divisors (18907848).

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

18189232 is a wasteful number, since it uses less digits than its factorization.

18189232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59860 (or 59854 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 18189232 is about 4264.8835857500. The cubic root of 18189232 is about 262.9893252280.

The spelling of 18189232 in words is "eighteen million, one hundred eighty-nine thousand, two hundred thirty-two".