840317538 has 16 divisors (see below), whose sum is σ = 1680932736. Its totient is φ = 280056240.

The previous prime is 840317521. The next prime is 840317539. The reversal of 840317538 is 835713048.

It is a super-2 number, since 2×840317538² = 1412267129340762888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840317496 and 840317505.

It is not an unprimeable number, because it can be changed into a prime (840317539) 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 7 ways as a sum of consecutive naturals, for example, 44103 + ... + 60213.

It is an arithmetic number, because the mean of its divisors is an integer number (105058296).

Almost surely, 2^840317538 is an apocalyptic number.

840317538 is an abundant number, since it is smaller than the sum of its proper divisors (840615198).

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

840317538 is a wasteful number, since it uses less digits than its factorization.

840317538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24809.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 840317538 is about 28988.2310257111. The cubic root of 840317538 is about 943.6576737130.

The spelling of 840317538 in words is "eight hundred forty million, three hundred seventeen thousand, five hundred thirty-eight".