1812616 has 32 divisors (see below), whose sum is σ = 3792600. Its totient is φ = 806400.

The previous prime is 1812611. The next prime is 1812623. The reversal of 1812616 is 6162181.

It can be written as a sum of positive squares in 4 ways, for example, as 1552516 + 260100 = 1246^2 + 510^2 .

It is not an unprimeable number, because it can be changed into a prime (1812611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2716 + ... + 3316.

2^1812616 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 1812616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1896300).

1812616 is an abundant number, since it is smaller than the sum of its proper divisors (1979984).

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

1812616 is a wasteful number, since it uses less digits than its factorization.

1812616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 645 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 1812616 is about 1346.3342824128. The cubic root of 1812616 is about 121.9275750375.

Adding to 1812616 its reverse (6162181), we get a palindrome (7974797).

The spelling of 1812616 in words is "one million, eight hundred twelve thousand, six hundred sixteen".