1806881 has 8 divisors (see below), whose sum is σ = 1934400. Its totient is φ = 1682640.

The previous prime is 1806877. The next prime is 1806887. The reversal of 1806881 is 1886081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1806881 - 2² = 1806877 is a prime.

It is a super-2 number, since 2×1806881² = 6529637896322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1806887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 1938.

It is an arithmetic number, because the mean of its divisors is an integer number (241800).

2^1806881 is an apocalyptic number.

It is an amenable number.

1806881 is a deficient number, since it is larger than the sum of its proper divisors (127519).

1806881 is a wasteful number, since it uses less digits than its factorization.

1806881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639.

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 1806881 is about 1344.2027376851. The cubic root of 1806881 is about 121.7988488562.

The spelling of 1806881 in words is "one million, eight hundred six thousand, eight hundred eighty-one".