879947905 has 4 divisors (see below), whose sum is σ = 1055937492. Its totient is φ = 703958320.

The previous prime is 879947903. The next prime is 879947909. The reversal of 879947905 is 509749978.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 442008576 + 437939329 = 21024^2 + 20927^2 .

It is not a de Polignac number, because 879947905 - 2¹ = 879947903 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 879947905.

It is not an unprimeable number, because it can be changed into a prime (879947903) 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, 87994786 + ... + 87994795.

It is an arithmetic number, because the mean of its divisors is an integer number (263984373).

Almost surely, 2^879947905 is an apocalyptic number.

It is an amenable number.

879947905 is a deficient number, since it is larger than the sum of its proper divisors (175989587).

879947905 is a wasteful number, since it uses less digits than its factorization.

879947905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175989586.

The product of its (nonzero) digits is 5715360, while the sum is 58.

The square root of 879947905 is about 29663.9158743413. The cubic root of 879947905 is about 958.2650612653.

The spelling of 879947905 in words is "eight hundred seventy-nine million, nine hundred forty-seven thousand, nine hundred five".