9720457 has 4 divisors (see below), whose sum is σ = 10232080. Its totient is φ = 9208836.

The previous prime is 9720449. The next prime is 9720463. The reversal of 9720457 is 7540279.

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: 7540279 = 181 ⋅41659.

It is a cyclic number.

It is not a de Polignac number, because 9720457 - 2³ = 9720449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9720407) 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, 255783 + ... + 255820.

It is an arithmetic number, because the mean of its divisors is an integer number (2558020).

Almost surely, 2^9720457 is an apocalyptic number.

It is an amenable number.

9720457 is a deficient number, since it is larger than the sum of its proper divisors (511623).

9720457 is a wasteful number, since it uses less digits than its factorization.

9720457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511622.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 9720457 is about 3117.7647441717. The cubic root of 9720457 is about 213.4169428677.

The spelling of 9720457 in words is "nine million, seven hundred twenty thousand, four hundred fifty-seven".