840874879 has 12 divisors (see below), whose sum is σ = 914887272. Its totient is φ = 772480800.

The previous prime is 840874841. The next prime is 840874889. The reversal of 840874879 is 978478048.

It is not a de Polignac number, because 840874879 - 2⁹ = 840874367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840874889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23869 + ... + 47449.

It is an arithmetic number, because the mean of its divisors is an integer number (76240606).

Almost surely, 2^840874879 is an apocalyptic number.

840874879 is a deficient number, since it is larger than the sum of its proper divisors (74012393).

840874879 is a wasteful number, since it uses less digits than its factorization.

840874879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23818 (or 23805 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 55.

The square root of 840874879 is about 28997.8426611360. The cubic root of 840874879 is about 943.8662547371.

It can be divided in two parts, 840874 and 879, that added together give a triangular number (841753 = T₁₂₉₇).

The spelling of 840874879 in words is "eight hundred forty million, eight hundred seventy-four thousand, eight hundred seventy-nine".