409881 has 8 divisors (see below), whose sum is σ = 549504. Its totient is φ = 271760.

The previous prime is 409879. The next prime is 409889. The reversal of 409881 is 188904.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 409881 - 2¹ = 409879 is a prime.

It is a super-2 number, since 2×409881² = 336004868322, which contains 22 as substring.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (409889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (68688).

2⁴⁰⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

409881 is a deficient number, since it is larger than the sum of its proper divisors (139623).

409881 is a wasteful number, since it uses less digits than its factorization.

409881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 409881 is about 640.2194936114. The cubic root of 409881 is about 74.2824003523.

The spelling of 409881 in words is "four hundred nine thousand, eight hundred eighty-one".