7320991 has 8 divisors (see below), whose sum is σ = 7616000. Its totient is φ = 7029720.

The previous prime is 7320983. The next prime is 7320997. The reversal of 7320991 is 1990237.

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

It is a cyclic number.

It is not a de Polignac number, because 7320991 - 2³ = 7320983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7320997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3460 + ... + 5158.

It is an arithmetic number, because the mean of its divisors is an integer number (952000).

Almost surely, 2^7320991 is an apocalyptic number.

7320991 is a deficient number, since it is larger than the sum of its proper divisors (295009).

7320991 is a wasteful number, since it uses less digits than its factorization.

7320991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 7320991 is about 2705.7329875655. The cubic root of 7320991 is about 194.1734994454.

The spelling of 7320991 in words is "seven million, three hundred twenty thousand, nine hundred ninety-one".