840534915 has 16 divisors (see below), whose sum is σ = 1467115776. Its totient is φ = 407532000.

The previous prime is 840534911. The next prime is 840534923. The reversal of 840534915 is 519435048.

It is not a de Polignac number, because 840534915 - 2² = 840534911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840534911) 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, 2546911 + ... + 2547240.

It is an arithmetic number, because the mean of its divisors is an integer number (91694736).

Almost surely, 2^840534915 is an apocalyptic number.

840534915 is a deficient number, since it is larger than the sum of its proper divisors (626580861).

840534915 is a wasteful number, since it uses less digits than its factorization.

840534915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094170.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 840534915 is about 28991.9801841820. The cubic root of 840534915 is about 943.7390365231.

The spelling of 840534915 in words is "eight hundred forty million, five hundred thirty-four thousand, nine hundred fifteen".