9999726 has 32 divisors (see below), whose sum is σ = 22007808. Its totient is φ = 3003840.

The previous prime is 9999713. The next prime is 9999739. The reversal of 9999726 is 6279999.

9999726 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9999713) and next prime (9999739).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7786 + ... + 8978.

It is an arithmetic number, because the mean of its divisors is an integer number (687744).

Almost surely, 2^9999726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11003904).

9999726 is an abundant number, since it is smaller than the sum of its proper divisors (12008082).

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

9999726 is a wasteful number, since it uses less digits than its factorization.

9999726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336.

The product of its digits is 551124, while the sum is 51.

The square root of 9999726 is about 3162.2343366677. The cubic root of 9999726 is about 215.4415012682.

The spelling of 9999726 in words is "nine million, nine hundred ninety-nine thousand, seven hundred twenty-six".