7721365 has 8 divisors (see below), whose sum is σ = 9289728. Its totient is φ = 6161040.

The previous prime is 7721359. The next prime is 7721369. The reversal of 7721365 is 5631277.

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

It is not a de Polignac number, because 7721365 - 2¹⁷ = 7590293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364 + ... + 3946.

It is an arithmetic number, because the mean of its divisors is an integer number (1161216).

Almost surely, 2^7721365 is an apocalyptic number.

It is an amenable number.

7721365 is a deficient number, since it is larger than the sum of its proper divisors (1568363).

7721365 is a wasteful number, since it uses less digits than its factorization.

7721365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019.

The product of its digits is 8820, while the sum is 31.

The square root of 7721365 is about 2778.7344241579. The cubic root of 7721365 is about 197.6505501671.

The spelling of 7721365 in words is "seven million, seven hundred twenty-one thousand, three hundred sixty-five".