840906726 has 64 divisors (see below), whose sum is σ = 1922973696. Its totient is φ = 242660000.

The previous prime is 840906721. The next prime is 840906727. The reversal of 840906726 is 627609048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840906721) 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, 379915 + ... + 382121.

It is an arithmetic number, because the mean of its divisors is an integer number (30046464).

Almost surely, 2^840906726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840906726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961486848).

840906726 is an abundant number, since it is smaller than the sum of its proper divisors (1082066970).

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

840906726 is a wasteful number, since it uses less digits than its factorization.

840906726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 840906726 is about 28998.3917829938. The cubic root of 840906726 is about 943.8781704731.

The spelling of 840906726 in words is "eight hundred forty million, nine hundred six thousand, seven hundred twenty-six".