840051879 has 4 divisors (see below), whose sum is σ = 1120069176. Its totient is φ = 560034584.

The previous prime is 840051869. The next prime is 840051887. The reversal of 840051879 is 978150048.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 840051879 - 2²⁴ = 823274663 is a prime.

It is a super-2 number, since 2×840051879² = 1411374318822861282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 840051879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840051809) 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 3 ways as a sum of consecutive naturals, for example, 140008644 + ... + 140008649.

It is an arithmetic number, because the mean of its divisors is an integer number (280017294).

Almost surely, 2^840051879 is an apocalyptic number.

840051879 is a deficient number, since it is larger than the sum of its proper divisors (280017297).

840051879 is a wasteful number, since it uses less digits than its factorization.

840051879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280017296.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 840051879 is about 28983.6484763392. The cubic root of 840051879 is about 943.5582202068.

The spelling of 840051879 in words is "eight hundred forty million, fifty-one thousand, eight hundred seventy-nine".