849660840 has 160 divisors (see below), whose sum is σ = 3263863680. Its totient is φ = 194203008.

The previous prime is 849660827. The next prime is 849660857. The reversal of 849660840 is 48066948.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3949 + ... + 41411.

It is an arithmetic number, because the mean of its divisors is an integer number (20399148).

Almost surely, 2^849660840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 849660840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1631931840).

849660840 is an abundant number, since it is smaller than the sum of its proper divisors (2414202840).

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

849660840 is a wasteful number, since it uses less digits than its factorization.

849660840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37493 (or 37480 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 849660840 is about 29148.9423478795. The cubic root of 849660840 is about 947.1422300347.

The spelling of 849660840 in words is "eight hundred forty-nine million, six hundred sixty thousand, eight hundred forty".