9999750 has 64 divisors (see below), whose sum is σ = 25459200. Its totient is φ = 2613600.

The previous prime is 9999749. The next prime is 9999761. The reversal of 9999750 is 579999.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9999750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50151 + ... + 50349.

It is an arithmetic number, because the mean of its divisors is an integer number (397800).

Almost surely, 2^9999750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12729600).

9999750 is an abundant number, since it is smaller than the sum of its proper divisors (15459450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999750 is a wasteful number, since it uses less digits than its factorization.

9999750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 229635, while the sum is 48.

The square root of 9999750 is about 3162.2381314506. The cubic root of 9999750 is about 215.4416736260.

The spelling of 9999750 in words is "nine million, nine hundred ninety-nine thousand, seven hundred fifty".