18394728 has 32 divisors (see below), whose sum is σ = 50168160. Its totient is φ = 5574080.

The previous prime is 18394723. The next prime is 18394741. The reversal of 18394728 is 82749381.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18394728.

It is not an unprimeable number, because it can be changed into a prime (18394721) 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, 34575 + ... + 35102.

It is an arithmetic number, because the mean of its divisors is an integer number (1567755).

Almost surely, 2^18394728 is an apocalyptic number.

It is an amenable number.

18394728 is an abundant number, since it is smaller than the sum of its proper divisors (31773432).

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

18394728 is a wasteful number, since it uses less digits than its factorization.

18394728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69697 (or 69693 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 18394728 is about 4288.9075532121. The cubic root of 18394728 is about 263.9760079207.

The spelling of 18394728 in words is "eighteen million, three hundred ninety-four thousand, seven hundred twenty-eight".