9728407 has 4 divisors (see below), whose sum is σ = 10476760. Its totient is φ = 8980056.

The previous prime is 9728401. The next prime is 9728417. The reversal of 9728407 is 7048279.

It is a happy number.

9728407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7048279 = 7 ⋅1006897.

It is a cyclic number.

It is not a de Polignac number, because 9728407 - 2¹¹ = 9726359 is a prime.

It is a Duffinian number.

9728407 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374157 + ... + 374182.

It is an arithmetic number, because the mean of its divisors is an integer number (2619190).

Almost surely, 2^9728407 is an apocalyptic number.

9728407 is a deficient number, since it is larger than the sum of its proper divisors (748353).

9728407 is a wasteful number, since it uses less digits than its factorization.

9728407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748352.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 9728407 is about 3119.0394354673. The cubic root of 9728407 is about 213.4751089381.

The spelling of 9728407 in words is "nine million, seven hundred twenty-eight thousand, four hundred seven".