9999649 has 8 divisors (see below), whose sum is σ = 10942848. Its totient is φ = 9062160.

The previous prime is 9999637. The next prime is 9999653. The reversal of 9999649 is 9469999.

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 9999649 - 2¹¹ = 9997601 is a prime.

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 9999649.

It is not an unprimeable number, because it can be changed into a prime (9999659) 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, 2799 + ... + 5275.

It is an arithmetic number, because the mean of its divisors is an integer number (1367856).

Almost surely, 2^9999649 is an apocalyptic number.

It is an amenable number.

9999649 is a deficient number, since it is larger than the sum of its proper divisors (943199).

9999649 is a wasteful number, since it uses less digits than its factorization.

9999649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855.

The product of its digits is 1417176, while the sum is 55.

The square root of 9999649 is about 3162.2221617084. Note that the first 3 decimals coincide. The cubic root of 9999649 is about 215.4409482851.

It can be divided in two parts, 9999 and 649, that added together give a cube (10648 = 22³).

The spelling of 9999649 in words is "nine million, nine hundred ninety-nine thousand, six hundred forty-nine".