849840 has 40 divisors (see below), whose sum is σ = 2635248. Its totient is φ = 226560.

The previous prime is 849839. The next prime is 849857. The reversal of 849840 is 48948.

It is a tau number, because it is divible by the number of its divisors (40).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 849840.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1531 + ... + 2010.

2⁸⁴⁹⁸⁴⁰ is an apocalyptic number.

849840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

849840 is an abundant number, since it is smaller than the sum of its proper divisors (1785408).

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

849840 is a wasteful number, since it uses less digits than its factorization.

849840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557 (or 3551 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 849840 is about 921.8676694624. The cubic root of 849840 is about 94.7208797018.

The spelling of 849840 in words is "eight hundred forty-nine thousand, eight hundred forty".