18428432 has 20 divisors (see below), whose sum is σ = 38951376. Its totient is φ = 8376480.

The previous prime is 18428419. The next prime is 18428437. The reversal of 18428432 is 23482481.

It is not an unprimeable number, because it can be changed into a prime (18428437) 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, 52178 + ... + 52529.

Almost surely, 2^18428432 is an apocalyptic number.

It is an amenable number.

18428432 is an abundant number, since it is smaller than the sum of its proper divisors (20522944).

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

18428432 is a wasteful number, since it uses less digits than its factorization.

18428432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104726 (or 104720 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 18428432 is about 4292.8349607223. The cubic root of 18428432 is about 264.1371341409.

The spelling of 18428432 in words is "eighteen million, four hundred twenty-eight thousand, four hundred thirty-two".