84638 has 8 divisors (see below), whose sum is σ = 128520. Its totient is φ = 41800.

The previous prime is 84631. The next prime is 84649. The reversal of 84638 is 83648.

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

It is a self number, because there is not a number n which added to its sum of digits gives 84638.

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 3 ways as a sum of consecutive naturals, for example, 8 + ... + 411.

It is an arithmetic number, because the mean of its divisors is an integer number (16065).

2⁸⁴⁶³⁸ is an apocalyptic number.

84638 is a deficient number, since it is larger than the sum of its proper divisors (43882).

84638 is a wasteful number, since it uses less digits than its factorization.

84638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522.

The product of its digits is 4608, while the sum is 29.

The square root of 84638 is about 290.9261074569. The cubic root of 84638 is about 43.9057901637.

Subtracting from 84638 its reverse (83648), we obtain a triangular number (990 = T₄₄).

The spelling of 84638 in words is "eighty-four thousand, six hundred thirty-eight".