1856881 has 4 divisors (see below), whose sum is σ = 1999732. Its totient is φ = 1714032.

The previous prime is 1856861. The next prime is 1856891. The reversal of 1856881 is 1886581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1886581 = 433 ⋅4357.

It can be written as a sum of positive squares in 2 ways, for example, as 378225 + 1478656 = 615^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1856881 - 2⁷ = 1856753 is a prime.

It is a super-2 number, since 2×1856881² = 6896014096322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1856881.

It is not an unprimeable number, because it can be changed into a prime (1856801) 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 3 ways as a sum of consecutive naturals, for example, 71406 + ... + 71431.

It is an arithmetic number, because the mean of its divisors is an integer number (499933).

2^1856881 is an apocalyptic number.

It is an amenable number.

1856881 is a deficient number, since it is larger than the sum of its proper divisors (142851).

1856881 is a wasteful number, since it uses less digits than its factorization.

1856881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142850.

The product of its digits is 15360, while the sum is 37.

The square root of 1856881 is about 1362.6742090463. The cubic root of 1856881 is about 122.9121147154.

The spelling of 1856881 in words is "one million, eight hundred fifty-six thousand, eight hundred eighty-one".