9390720321 has 24 divisors (see below), whose sum is σ = 14465636640. Its totient is φ = 5849813376.

The previous prime is 9390720293. The next prime is 9390720323. The reversal of 9390720321 is 1230270939.

It is not a de Polignac number, because 9390720321 - 2⁷ = 9390720193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9390720323) 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, 199515 + ... + 242048.

It is an arithmetic number, because the mean of its divisors is an integer number (602734860).

Almost surely, 2^9390720321 is an apocalyptic number.

It is an amenable number.

9390720321 is a deficient number, since it is larger than the sum of its proper divisors (5074916319).

9390720321 is a wasteful number, since it uses less digits than its factorization.

9390720321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441725 (or 441722 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 9390720321 is about 96905.7290411666. The cubic root of 9390720321 is about 2109.7595857495.

The spelling of 9390720321 in words is "nine billion, three hundred ninety million, seven hundred twenty thousand, three hundred twenty-one".