881409 has 4 divisors (see below), whose sum is σ = 1175216. Its totient is φ = 587604.

The previous prime is 881407. The next prime is 881411. The reversal of 881409 is 904188.

It is a happy number.

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.

It is an interprime number because it is at equal distance from previous prime (881407) and next prime (881411).

It is not a de Polignac number, because 881409 - 2¹ = 881407 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 881409.

It is not an unprimeable number, because it can be changed into a prime (881407) 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, 146899 + ... + 146904.

It is an arithmetic number, because the mean of its divisors is an integer number (293804).

2⁸⁸¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

881409 is a deficient number, since it is larger than the sum of its proper divisors (293807).

881409 is a wasteful number, since it uses less digits than its factorization.

881409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293806.

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

The square root of 881409 is about 938.8338511153. The cubic root of 881409 is about 95.8795146460.

The spelling of 881409 in words is "eight hundred eighty-one thousand, four hundred nine".