849649839 has 4 divisors (see below), whose sum is σ = 1132866456. Its totient is φ = 566433224.

The previous prime is 849649799. The next prime is 849649873. The reversal of 849649839 is 938946948.

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

It is a cyclic number.

It is not a de Polignac number, because 849649839 - 2⁸ = 849649583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849649039) 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, 141608304 + ... + 141608309.

It is an arithmetic number, because the mean of its divisors is an integer number (283216614).

Almost surely, 2^849649839 is an apocalyptic number.

849649839 is a deficient number, since it is larger than the sum of its proper divisors (283216617).

849649839 is a wasteful number, since it uses less digits than its factorization.

849649839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283216616.

The product of its digits is 13436928, while the sum is 60.

The square root of 849649839 is about 29148.7536440240. The cubic root of 849649839 is about 947.1381423030.

The spelling of 849649839 in words is "eight hundred forty-nine million, six hundred forty-nine thousand, eight hundred thirty-nine".