840005979 has 8 divisors (see below), whose sum is σ = 1178955840. Its totient is φ = 530530056.

The previous prime is 840005927. The next prime is 840005983. The reversal of 840005979 is 979500048.

840005979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 840005979 - 2¹⁹ = 839481691 is a prime.

It is a super-2 number, since 2×840005979² = 1411220089511496882, 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 840005979.

It is not an unprimeable number, because it can be changed into a prime (840005279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7368417 + ... + 7368530.

It is an arithmetic number, because the mean of its divisors is an integer number (147369480).

Almost surely, 2^840005979 is an apocalyptic number.

840005979 is a deficient number, since it is larger than the sum of its proper divisors (338949861).

840005979 is a wasteful number, since it uses less digits than its factorization.

840005979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14736969.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 840005979 is about 28982.8566397448. The cubic root of 840005979 is about 943.5410347161.

The spelling of 840005979 in words is "eight hundred forty million, five thousand, nine hundred seventy-nine".