840187138 has 16 divisors (see below), whose sum is σ = 1443657600. Its totient is φ = 359246016.

The previous prime is 840187133. The next prime is 840187147. The reversal of 840187138 is 831781048.

It is a self number, because there is not a number n which added to its sum of digits gives 840187138.

It is not an unprimeable number, because it can be changed into a prime (840187133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63238 + ... + 75361.

It is an arithmetic number, because the mean of its divisors is an integer number (90228600).

Almost surely, 2^840187138 is an apocalyptic number.

840187138 is a deficient number, since it is larger than the sum of its proper divisors (603470462).

840187138 is a wasteful number, since it uses less digits than its factorization.

840187138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139041.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 840187138 is about 28985.9817498045. The cubic root of 840187138 is about 943.6088591000.

The spelling of 840187138 in words is "eight hundred forty million, one hundred eighty-seven thousand, one hundred thirty-eight".