1881385 has 16 divisors (see below), whose sum is σ = 2499840. Its totient is φ = 1347840.

The previous prime is 1881349. The next prime is 1881389. The reversal of 1881385 is 5831881.

It is not a de Polignac number, because 1881385 - 2¹⁵ = 1848617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1881385.

It is not an unprimeable number, because it can be changed into a prime (1881389) 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, 4129 + ... + 4561.

It is an arithmetic number, because the mean of its divisors is an integer number (156240).

2^1881385 is an apocalyptic number.

It is an amenable number.

1881385 is a deficient number, since it is larger than the sum of its proper divisors (618455).

1881385 is a wasteful number, since it uses less digits than its factorization.

1881385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its digits is 7680, while the sum is 34.

The square root of 1881385 is about 1371.6358846283. The cubic root of 1881385 is about 123.4504163699.

The spelling of 1881385 in words is "one million, eight hundred eighty-one thousand, three hundred eighty-five".