9878905 has 8 divisors (see below), whose sum is σ = 11888712. Its totient is φ = 7880448.

The previous prime is 9878903. The next prime is 9878923. The reversal of 9878905 is 5098789.

It can be written as a sum of positive squares in 4 ways, for example, as 2393209 + 7485696 = 1547^2 + 2736^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9878905 - 2¹ = 9878903 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9878903) 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, 784 + ... + 4513.

It is an arithmetic number, because the mean of its divisors is an integer number (1486089).

Almost surely, 2^9878905 is an apocalyptic number.

It is an amenable number.

9878905 is a deficient number, since it is larger than the sum of its proper divisors (2009807).

9878905 is a wasteful number, since it uses less digits than its factorization.

9878905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5675.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 9878905 is about 3143.0725413200. The cubic root of 9878905 is about 214.5702973407.

It can be divided in two parts, 98 and 78905, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 9878905 in words is "nine million, eight hundred seventy-eight thousand, nine hundred five".