840381138 has 48 divisors (see below), whose sum is σ = 1842137856. Its totient is φ = 276868800.

The previous prime is 840381109. The next prime is 840381149. The reversal of 840381138 is 831183048.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 632631 + ... + 633957.

It is an arithmetic number, because the mean of its divisors is an integer number (38377872).

Almost surely, 2^840381138 is an apocalyptic number.

840381138 is an abundant number, since it is smaller than the sum of its proper divisors (1001756718).

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

840381138 is a wasteful number, since it uses less digits than its factorization.

840381138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1716 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 840381138 is about 28989.3280018699. The cubic root of 840381138 is about 943.6814802350.

The spelling of 840381138 in words is "eight hundred forty million, three hundred eighty-one thousand, one hundred thirty-eight".