839883640 has 128 divisors (see below), whose sum is σ = 2116316160. Its totient is φ = 298338304.

The previous prime is 839883613. The next prime is 839883641. The reversal of 839883640 is 46388938.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (839883641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1297797 + ... + 1298443.

It is an arithmetic number, because the mean of its divisors is an integer number (16533720).

Almost surely, 2^839883640 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 839883640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058158080).

839883640 is an abundant number, since it is smaller than the sum of its proper divisors (1276432520).

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

839883640 is a wasteful number, since it uses less digits than its factorization.

839883640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 839883640 is about 28980.7460221437. The cubic root of 839883640 is about 943.4952265220.

The spelling of 839883640 in words is "eight hundred thirty-nine million, eight hundred eighty-three thousand, six hundred forty".