985409 has 4 divisors (see below), whose sum is σ = 999360. Its totient is φ = 971460.

The previous prime is 985403. The next prime is 985417. The reversal of 985409 is 904589.

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 a de Polignac number, because none of the positive numbers 2^k-985409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985403) 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, 6869 + ... + 7010.

It is an arithmetic number, because the mean of its divisors is an integer number (249840).

2⁹⁸⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

985409 is a deficient number, since it is larger than the sum of its proper divisors (13951).

985409 is a wasteful number, since it uses less digits than its factorization.

985409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13950.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 985409 is about 992.6776919021. The cubic root of 985409 is about 99.5112484442.

The spelling of 985409 in words is "nine hundred eighty-five thousand, four hundred nine".