840781938 has 32 divisors (see below), whose sum is σ = 1740533760. Its totient is φ = 270481680.

The previous prime is 840781933. The next prime is 840781961. The reversal of 840781938 is 839187048.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (840781933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64531 + ... + 76457.

It is an arithmetic number, because the mean of its divisors is an integer number (54391680).

Almost surely, 2^840781938 is an apocalyptic number.

840781938 is an abundant number, since it is smaller than the sum of its proper divisors (899751822).

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

840781938 is a wasteful number, since it uses less digits than its factorization.

840781938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12342.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 840781938 is about 28996.2400666017. The cubic root of 840781938 is about 943.8314786136.

The spelling of 840781938 in words is "eight hundred forty million, seven hundred eighty-one thousand, nine hundred thirty-eight".