1881855 has 48 divisors (see below), whose sum is σ = 3594240. Its totient is φ = 907200.

The previous prime is 1881853. The next prime is 1881863. The reversal of 1881855 is 5581881.

It is not a de Polignac number, because 1881855 - 2¹ = 1881853 is a prime.

1881855 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881851) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26470 + ... + 26540.

It is an arithmetic number, because the mean of its divisors is an integer number (74880).

2^1881855 is an apocalyptic number.

1881855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1881855 is a deficient number, since it is larger than the sum of its proper divisors (1712385).

1881855 is a wasteful number, since it uses less digits than its factorization.

1881855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 129 counting only the distinct ones).

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

The square root of 1881855 is about 1371.8072021972. The cubic root of 1881855 is about 123.4606954754.

The spelling of 1881855 in words is "one million, eight hundred eighty-one thousand, eight hundred fifty-five".