9720749 has 4 divisors (see below), whose sum is σ = 9743136. Its totient is φ = 9698364.

The previous prime is 9720727. The next prime is 9720757. The reversal of 9720749 is 9470279.

It is a happy number.

9720749 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9720749 is a prime.

It is a super-2 number, since 2×9720749² = 188985922242002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9720769) 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, 10529 + ... + 11414.

It is an arithmetic number, because the mean of its divisors is an integer number (2435784).

Almost surely, 2^9720749 is an apocalyptic number.

It is an amenable number.

9720749 is a deficient number, since it is larger than the sum of its proper divisors (22387).

9720749 is a wasteful number, since it uses less digits than its factorization.

9720749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22386.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 9720749 is about 3117.8115722410. The cubic root of 9720749 is about 213.4190798428.

The spelling of 9720749 in words is "nine million, seven hundred twenty thousand, seven hundred forty-nine".