826409 has 4 divisors (see below), whose sum is σ = 828240. Its totient is φ = 824580.

The previous prime is 826403. The next prime is 826411. The reversal of 826409 is 904628.

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 a cyclic number.

It is not a de Polignac number, because 826409 - 2⁴ = 826393 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (826403) 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, 302 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (207060).

2⁸²⁶⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

826409 is a deficient number, since it is larger than the sum of its proper divisors (1831).

826409 is a wasteful number, since it uses less digits than its factorization.

826409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 826409 is about 909.0704043142. The cubic root of 826409 is about 93.8422357428.

The spelling of 826409 in words is "eight hundred twenty-six thousand, four hundred nine".