984509 has 4 divisors (see below), whose sum is σ = 1005504. Its totient is φ = 963516.

The previous prime is 984497. The next prime is 984539. The reversal of 984509 is 905489.

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, and also an emirpimes, since its reverse is a distinct semiprime: 905489 = 13 ⋅69653.

It is a cyclic number.

It is not a de Polignac number, because 984509 - 2⁸ = 984253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 984509.

It is not an unprimeable number, because it can be changed into a prime (984539) 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, 10427 + ... + 10520.

It is an arithmetic number, because the mean of its divisors is an integer number (251376).

2⁹⁸⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

984509 is a deficient number, since it is larger than the sum of its proper divisors (20995).

984509 is a wasteful number, since it uses less digits than its factorization.

984509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20994.

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

The square root of 984509 is about 992.2242690037. The cubic root of 984509 is about 99.4809438014.

The spelling of 984509 in words is "nine hundred eighty-four thousand, five hundred nine".