9953721 has 24 divisors (see below), whose sum is σ = 15466464. Its totient is φ = 6145920.

The previous prime is 9953719. The next prime is 9953737. The reversal of 9953721 is 1273599.

It is not a de Polignac number, because 9953721 - 2¹ = 9953719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9953711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9766 + ... + 10736.

It is an arithmetic number, because the mean of its divisors is an integer number (644436).

Almost surely, 2^9953721 is an apocalyptic number.

It is an amenable number.

9953721 is a deficient number, since it is larger than the sum of its proper divisors (5512743).

9953721 is a wasteful number, since it uses less digits than its factorization.

9953721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1058 counting only the distinct ones).

The product of its digits is 17010, while the sum is 36.

The square root of 9953721 is about 3154.9518221361. The cubic root of 9953721 is about 215.1106047096.

The spelling of 9953721 in words is "nine million, nine hundred fifty-three thousand, seven hundred twenty-one".