9999738 has 48 divisors (see below), whose sum is σ = 26070720. Its totient is φ = 2706048.

The previous prime is 9999713. The next prime is 9999739. The reversal of 9999738 is 8379999.

It is a happy number.

9999738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9999739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306 + ... + 4482.

It is an arithmetic number, because the mean of its divisors is an integer number (543140).

Almost surely, 2^9999738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13035360).

9999738 is an abundant number, since it is smaller than the sum of its proper divisors (16070982).

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

9999738 is a wasteful number, since it uses less digits than its factorization.

9999738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4211 (or 4208 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 9999738 is about 3162.2362340597. The cubic root of 9999738 is about 215.4415874471.

The spelling of 9999738 in words is "nine million, nine hundred ninety-nine thousand, seven hundred thirty-eight".