9998649 has 18 divisors (see below), whose sum is σ = 14969006. Its totient is φ = 6431040.

The previous prime is 9998641. The next prime is 9998689. The reversal of 9998649 is 9468999.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3873024 + 6125625 = 1968^2 + 2475^2 .

It is not a de Polignac number, because 9998649 - 2³ = 9998641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9998595 and 9998604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6909 + ... + 8229.

Almost surely, 2^9998649 is an apocalyptic number.

It is an amenable number.

9998649 is a deficient number, since it is larger than the sum of its proper divisors (4970357).

9998649 is a wasteful number, since it uses less digits than its factorization.

9998649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385 (or 1353 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 9998649 is about 3162.0640410972. The cubic root of 9998649 is about 215.4337664287.

The spelling of 9998649 in words is "nine million, nine hundred ninety-eight thousand, six hundred forty-nine".