849640 has 32 divisors (see below), whose sum is σ = 2086560. Its totient is φ = 308800.

The previous prime is 849601. The next prime is 849649. The reversal of 849640 is 46948.

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, 526 + ... + 1405.

It is an arithmetic number, because the mean of its divisors is an integer number (65205).

2⁸⁴⁹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

849640 is an abundant number, since it is smaller than the sum of its proper divisors (1236920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

849640 is a wasteful number, since it uses less digits than its factorization.

849640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953 (or 1949 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 849640 is about 921.7591876407. The cubic root of 849640 is about 94.7134486315.

The spelling of 849640 in words is "eight hundred forty-nine thousand, six hundred forty".