84639 has 8 divisors (see below), whose sum is σ = 114480. Its totient is φ = 55616.

The previous prime is 84631. The next prime is 84649. The reversal of 84639 is 93648.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84639 - 2³ = 84631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109 + ... + 425.

It is an arithmetic number, because the mean of its divisors is an integer number (14310).

2⁸⁴⁶³⁹ is an apocalyptic number.

84639 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

84639 is a deficient number, since it is larger than the sum of its proper divisors (29841).

84639 is a wasteful number, since it uses less digits than its factorization.

84639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409.

The product of its digits is 5184, while the sum is 30.

The square root of 84639 is about 290.9278261013. The cubic root of 84639 is about 43.9059630791.

Subtracting 84639 from its reverse (93648), we obtain a palindrome (9009).

It can be divided in two parts, 8463 and 9, that multiplied together give a palindrome (76167).

The spelling of 84639 in words is "eighty-four thousand, six hundred thirty-nine".