1881306 has 72 divisors (see below), whose sum is σ = 4979520. Its totient is φ = 530712.

The previous prime is 1881289. The next prime is 1881307. The reversal of 1881306 is 6031881.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881306.

It is not an unprimeable number, because it can be changed into a prime (1881307) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23775 + ... + 23853.

It is an arithmetic number, because the mean of its divisors is an integer number (69160).

2^1881306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1881306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2489760).

1881306 is an abundant number, since it is smaller than the sum of its proper divisors (3098214).

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

1881306 is an equidigital number, since it uses as much as digits as its factorization.

1881306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1881306 is about 1371.6070865959. The cubic root of 1881306 is about 123.4486884373.

It can be divided in two parts, 1881 and 306, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1881306 in words is "one million, eight hundred eighty-one thousand, three hundred six".