18705432 has 32 divisors (see below), whose sum is σ = 47113200. Its totient is φ = 6188544.

The previous prime is 18705409. The next prime is 18705439. The reversal of 18705432 is 23450781.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18705432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705439) 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 7 ways as a sum of consecutive naturals, for example, 444 + ... + 6132.

Almost surely, 2^18705432 is an apocalyptic number.

18705432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18705432 is an abundant number, since it is smaller than the sum of its proper divisors (28407768).

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

18705432 is a wasteful number, since it uses less digits than its factorization.

18705432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5835 (or 5831 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 18705432 is about 4324.9776878037. The cubic root of 18705432 is about 265.4539838891.

The spelling of 18705432 in words is "eighteen million, seven hundred five thousand, four hundred thirty-two".