1816728 has 32 divisors (see below), whose sum is σ = 4622400. Its totient is φ = 594848.

The previous prime is 1816699. The next prime is 1816729. The reversal of 1816728 is 8276181.

It is a happy number.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816729) 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, 775 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (144450).

2^1816728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1816728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2311200).

1816728 is an abundant number, since it is smaller than the sum of its proper divisors (2805672).

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

1816728 is a wasteful number, since it uses less digits than its factorization.

1816728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1347 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 1816728 is about 1347.8605269092. The cubic root of 1816728 is about 122.0197047810.

The spelling of 1816728 in words is "one million, eight hundred sixteen thousand, seven hundred twenty-eight".