1811628 has 108 divisors (see below), whose sum is σ = 5809440. Its totient is φ = 471744.

The previous prime is 1811627. The next prime is 1811647. The reversal of 1811628 is 8261181.

It is not an unprimeable number, because it can be changed into a prime (1811627) 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 35 ways as a sum of consecutive naturals, for example, 22893 + ... + 22971.

2^1811628 is an apocalyptic number.

1811628 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 1811628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2904720).

1811628 is an abundant number, since it is smaller than the sum of its proper divisors (3997812).

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

1811628 is a wasteful number, since it uses less digits than its factorization.

1811628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 104 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1811628 is about 1345.9673101528. The cubic root of 1811628 is about 121.9054180485.

The spelling of 1811628 in words is "one million, eight hundred eleven thousand, six hundred twenty-eight".