1881139 has 6 divisors (see below), whose sum is σ = 2037156. Its totient is φ = 1736280.

The previous prime is 1881127. The next prime is 1881151. The reversal of 1881139 is 9311881.

It is an interprime number because it is at equal distance from previous prime (1881127) and next prime (1881151).

It is a de Polignac number, because none of the positive numbers 2^k-1881139 is a prime.

It is a Duffinian number.

1881139 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881139.

It is not an unprimeable number, because it can be changed into a prime (1881109) 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 5 ways as a sum of consecutive naturals, for example, 5397 + ... + 5734.

It is an arithmetic number, because the mean of its divisors is an integer number (339526).

2^1881139 is an apocalyptic number.

1881139 is a deficient number, since it is larger than the sum of its proper divisors (156017).

1881139 is a wasteful number, since it uses less digits than its factorization.

1881139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11157 (or 11144 counting only the distinct ones).

The product of its digits is 1728, while the sum is 31.

The square root of 1881139 is about 1371.5462077524. The cubic root of 1881139 is about 123.4450355598.

The spelling of 1881139 in words is "one million, eight hundred eighty-one thousand, one hundred thirty-nine".