9879872 has 14 divisors (see below), whose sum is σ = 19605498. Its totient is φ = 4939904.

The previous prime is 9879871. The next prime is 9879901. The reversal of 9879872 is 2789789.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7268416 + 2611456 = 2696^2 + 1616^2 .

It is a super-2 number, since 2×9879872² = 195223741472768, 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 9879872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9879871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77123 + ... + 77250.

Almost surely, 2^9879872 is an apocalyptic number.

It is an amenable number.

9879872 is a deficient number, since it is larger than the sum of its proper divisors (9725626).

9879872 is a wasteful number, since it uses less digits than its factorization.

9879872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154385 (or 154375 counting only the distinct ones).

The product of its digits is 508032, while the sum is 50.

The square root of 9879872 is about 3143.2263679220. The cubic root of 9879872 is about 214.5772982080.

The spelling of 9879872 in words is "nine million, eight hundred seventy-nine thousand, eight hundred seventy-two".