13818728 has 32 divisors (see below), whose sum is σ = 32304960. Its totient is φ = 5383680.

The previous prime is 13818689. The next prime is 13818731. The reversal of 13818728 is 82781831.

It is a junction number, because it is equal to n+sod(n) for n = 13818691 and 13818700.

It is an unprimeable number.

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, 10601 + ... + 11832.

It is an arithmetic number, because the mean of its divisors is an integer number (1009530).

Almost surely, 2^13818728 is an apocalyptic number.

It is an amenable number.

13818728 is an abundant number, since it is smaller than the sum of its proper divisors (18486232).

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

13818728 is a wasteful number, since it uses less digits than its factorization.

13818728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22457 (or 22453 counting only the distinct ones).

The product of its digits is 21504, while the sum is 38.

The square root of 13818728 is about 3717.3549736338. The cubic root of 13818728 is about 239.9694868615.

The spelling of 13818728 in words is "thirteen million, eight hundred eighteen thousand, seven hundred twenty-eight".