384639 has 4 divisors (see below), whose sum is σ = 512856. Its totient is φ = 256424.

The previous prime is 384623. The next prime is 384641. The reversal of 384639 is 936483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936483 = 3 ⋅312161.

It is a cyclic number.

It is not a de Polignac number, because 384639 - 2⁴ = 384623 is a prime.

It is a D-number.

384639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384619) 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, 64104 + ... + 64109.

It is an arithmetic number, because the mean of its divisors is an integer number (128214).

2³⁸⁴⁶³⁹ is an apocalyptic number.

384639 is a deficient number, since it is larger than the sum of its proper divisors (128217).

384639 is a wasteful number, since it uses less digits than its factorization.

384639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128216.

The product of its digits is 15552, while the sum is 33.

The square root of 384639 is about 620.1927119856. The cubic root of 384639 is about 72.7251187336.

The spelling of 384639 in words is "three hundred eighty-four thousand, six hundred thirty-nine".