840931956 has 60 divisors (see below), whose sum is σ = 2235673440. Its totient is φ = 275553360.

The previous prime is 840931933. The next prime is 840931969. The reversal of 840931956 is 659139048.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2880 + ... + 41111.

It is an arithmetic number, because the mean of its divisors is an integer number (37261224).

Almost surely, 2^840931956 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 840931956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1117836720).

840931956 is an abundant number, since it is smaller than the sum of its proper divisors (1394741484).

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

840931956 is a wasteful number, since it uses less digits than its factorization.

840931956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44066 (or 44055 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 840931956 is about 28998.8268038554. The cubic root of 840931956 is about 943.8876102073.

The spelling of 840931956 in words is "eight hundred forty million, nine hundred thirty-one thousand, nine hundred fifty-six".