1881642 has 32 divisors (see below), whose sum is σ = 4368384. Its totient is φ = 529200.

The previous prime is 1881641. The next prime is 1881697. The reversal of 1881642 is 2461881.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881641) 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 15 ways as a sum of consecutive naturals, for example, 2667 + ... + 3297.

It is an arithmetic number, because the mean of its divisors is an integer number (136512).

2^1881642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1881642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2184192).

1881642 is an abundant number, since it is smaller than the sum of its proper divisors (2486742).

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

1881642 is a wasteful number, since it uses less digits than its factorization.

1881642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714.

The product of its digits is 3072, while the sum is 30.

The square root of 1881642 is about 1371.7295651840. The cubic root of 1881642 is about 123.4560372844.

It can be divided in two parts, 188 and 1642, that added together give a triangular number (1830 = T₆₀).

The spelling of 1881642 in words is "one million, eight hundred eighty-one thousand, six hundred forty-two".