9978669 has 12 divisors (see below), whose sum is σ = 14520636. Its totient is φ = 6603072.

The previous prime is 9978659. The next prime is 9978719. The reversal of 9978669 is 9668799.

It can be written as a sum of positive squares in 2 ways, for example, as 5116644 + 4862025 = 2262^2 + 2205^2 .

It is not a de Polignac number, because 9978669 - 2⁴ = 9978653 is a prime.

It is a super-2 number, since 2×9978669² = 199147670023122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2814 + ... + 5279.

It is an arithmetic number, because the mean of its divisors is an integer number (1210053).

Almost surely, 2^9978669 is an apocalyptic number.

It is an amenable number.

9978669 is a deficient number, since it is larger than the sum of its proper divisors (4541967).

9978669 is a wasteful number, since it uses less digits than its factorization.

9978669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8236 (or 8233 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 9978669 is about 3158.9031324180. The cubic root of 9978669 is about 215.2901724646.

The spelling of 9978669 in words is "nine million, nine hundred seventy-eight thousand, six hundred sixty-nine".