849639 has 8 divisors (see below), whose sum is σ = 1294720. Its totient is φ = 485496.

The previous prime is 849601. The next prime is 849649. The reversal of 849639 is 936948.

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

It is not a de Polignac number, because 849639 - 2⁸ = 849383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 849597 and 849606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849649) 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, 20209 + ... + 20250.

It is an arithmetic number, because the mean of its divisors is an integer number (161840).

2⁸⁴⁹⁶³⁹ is an apocalyptic number.

849639 is a deficient number, since it is larger than the sum of its proper divisors (445081).

849639 is a wasteful number, since it uses less digits than its factorization.

849639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40469.

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

The square root of 849639 is about 921.7586451995. The cubic root of 849639 is about 94.7134114732.

The spelling of 849639 in words is "eight hundred forty-nine thousand, six hundred thirty-nine".