1918728 has 112 divisors (see below), whose sum is σ = 6295680. Its totient is φ = 536544.

The previous prime is 1918687. The next prime is 1918733. The reversal of 1918728 is 8278191.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1918692 and 1918701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 40801 + ... + 40847.

2^1918728 is an apocalyptic number.

1918728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3147840).

1918728 is an abundant number, since it is smaller than the sum of its proper divisors (4376952).

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

1918728 is an equidigital number, since it uses as much as digits as its factorization.

1918728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 59 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1918728 is about 1385.1815765451. The cubic root of 1918728 is about 124.2618469542.

The spelling of 1918728 in words is "one million, nine hundred eighteen thousand, seven hundred twenty-eight".