9623721 has 8 divisors (see below), whose sum is σ = 12846400. Its totient is φ = 6408432.

The previous prime is 9623699. The next prime is 9623743. The reversal of 9623721 is 1273269.

It is an interprime number because it is at equal distance from previous prime (9623699) and next prime (9623743).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9623721 - 2⁵ = 9623689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9623771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3051 + ... + 5343.

It is an arithmetic number, because the mean of its divisors is an integer number (1605800).

Almost surely, 2^9623721 is an apocalyptic number.

It is an amenable number.

9623721 is a deficient number, since it is larger than the sum of its proper divisors (3222679).

9623721 is a wasteful number, since it uses less digits than its factorization.

9623721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695.

The product of its digits is 4536, while the sum is 30.

The square root of 9623721 is about 3102.2122751353. The cubic root of 9623721 is about 212.7066207148.

The spelling of 9623721 in words is "nine million, six hundred twenty-three thousand, seven hundred twenty-one".