1855881 has 6 divisors (see below), whose sum is σ = 2680730. Its totient is φ = 1237248.

The previous prime is 1855853. The next prime is 1855891. The reversal of 1855881 is 1885581.

It can be written as a sum of positive squares in only one way, i.e., 1798281 + 57600 = 1341^2 + 240^2 .

It is not a de Polignac number, because 1855881 - 2⁵ = 1855849 is a prime.

It is a super-2 number, since 2×1855881² = 6888588572322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1855811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103096 + ... + 103113.

2^1855881 is an apocalyptic number.

It is an amenable number.

1855881 is a deficient number, since it is larger than the sum of its proper divisors (824849).

1855881 is a wasteful number, since it uses less digits than its factorization.

1855881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206215 (or 206212 counting only the distinct ones).

The product of its digits is 12800, while the sum is 36.

The square root of 1855881 is about 1362.3072340702. The cubic root of 1855881 is about 122.8900464936.

Adding to 1855881 its product of digits (12800), we get a palindrome (1868681).

The spelling of 1855881 in words is "one million, eight hundred fifty-five thousand, eight hundred eighty-one".