984639 has 4 divisors (see below), whose sum is σ = 1312856. Its totient is φ = 656424.

The previous prime is 984617. The next prime is 984667. The reversal of 984639 is 936489.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 984639 - 2⁸ = 984383 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 984597 and 984606.

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 984639.

It is not an unprimeable number, because it can be changed into a prime (984689) 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, 164104 + ... + 164109.

It is an arithmetic number, because the mean of its divisors is an integer number (328214).

2⁹⁸⁴⁶³⁹ is an apocalyptic number.

984639 is a deficient number, since it is larger than the sum of its proper divisors (328217).

984639 is a wasteful number, since it uses less digits than its factorization.

984639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328216.

The product of its digits is 46656, while the sum is 39.

The square root of 984639 is about 992.2897762247. The cubic root of 984639 is about 99.4853222796.

It can be divided in two parts, 9 and 84639, that added together give a palindrome (84648).

The spelling of 984639 in words is "nine hundred eighty-four thousand, six hundred thirty-nine".