1881045 has 12 divisors (see below), whose sum is σ = 3260556. Its totient is φ = 1003200.

The previous prime is 1881041. The next prime is 1881071. The reversal of 1881045 is 5401881.

It can be written as a sum of positive squares in 2 ways, for example, as 224676 + 1656369 = 474^2 + 1287^2 .

It is not a de Polignac number, because 1881045 - 2² = 1881041 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20856 + ... + 20945.

It is an arithmetic number, because the mean of its divisors is an integer number (271713).

2^1881045 is an apocalyptic number.

1881045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1881045 is a deficient number, since it is larger than the sum of its proper divisors (1379511).

1881045 is a wasteful number, since it uses less digits than its factorization.

1881045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41812 (or 41809 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1881045 is about 1371.5119394303. The cubic root of 1881045 is about 123.4429793541.

The spelling of 1881045 in words is "one million, eight hundred eighty-one thousand, forty-five".