18839728 has 40 divisors (see below), whose sum is σ = 37671200. Its totient is φ = 9123840.

The previous prime is 18839713. The next prime is 18839729. The reversal of 18839728 is 82793881.

It is a super-2 number, since 2×18839728² = 709870702227968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18839729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94573 + ... + 94771.

It is an arithmetic number, because the mean of its divisors is an integer number (941780).

Almost surely, 2^18839728 is an apocalyptic number.

It is an amenable number.

18839728 is a deficient number, since it is larger than the sum of its proper divisors (18831472).

18839728 is a wasteful number, since it uses less digits than its factorization.

18839728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 359 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The square root of 18839728 is about 4340.4755499830. The cubic root of 18839728 is about 266.0877468818.

It can be divided in two parts, 1883 and 9728, that added together give a palindrome (11611).

The spelling of 18839728 in words is "eighteen million, eight hundred thirty-nine thousand, seven hundred twenty-eight".