1005881 has 4 divisors (see below), whose sum is σ = 1008000. Its totient is φ = 1003764.

The previous prime is 1005833. The next prime is 1005883. The reversal of 1005881 is 1885001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1885001 = 97 ⋅19433.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005881 is a prime.

It is a super-2 number, since 2×1005881² = 2023593172322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (252000).

2^1005881 is an apocalyptic number.

It is an amenable number.

1005881 is a deficient number, since it is larger than the sum of its proper divisors (2119).

1005881 is an equidigital number, since it uses as much as digits as its factorization.

1005881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 1005881 is about 1002.9361893959. The cubic root of 1005881 is about 100.1956502933.

The spelling of 1005881 in words is "one million, five thousand, eight hundred eighty-one".