9772721 has 4 divisors (see below), whose sum is σ = 11168832. Its totient is φ = 8376612.

The previous prime is 9772717. The next prime is 9772727. The reversal of 9772721 is 1272779.

9772721 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, and also an emirpimes, since its reverse is a distinct semiprime: 1272779 = 151 ⋅8429.

It is a cyclic number.

It is not a de Polignac number, because 9772721 - 2² = 9772717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9772727) 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, 698045 + ... + 698058.

It is an arithmetic number, because the mean of its divisors is an integer number (2792208).

Almost surely, 2^9772721 is an apocalyptic number.

It is an amenable number.

9772721 is a deficient number, since it is larger than the sum of its proper divisors (1396111).

9772721 is a wasteful number, since it uses less digits than its factorization.

9772721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396110.

The product of its digits is 12348, while the sum is 35.

The square root of 9772721 is about 3126.1351538281. The cubic root of 9772721 is about 213.7987524878.

The spelling of 9772721 in words is "nine million, seven hundred seventy-two thousand, seven hundred twenty-one".