7721379 has 8 divisors (see below), whose sum is σ = 11439120. Its totient is φ = 5147568.

The previous prime is 7721377. The next prime is 7721393. The reversal of 7721379 is 9731277.

7721379 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7721379 - 2¹ = 7721377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7721377) 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, 142962 + ... + 143015.

It is an arithmetic number, because the mean of its divisors is an integer number (1429890).

Almost surely, 2^7721379 is an apocalyptic number.

7721379 is a deficient number, since it is larger than the sum of its proper divisors (3717741).

7721379 is a wasteful number, since it uses less digits than its factorization.

7721379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285986 (or 285980 counting only the distinct ones).

The product of its digits is 18522, while the sum is 36.

The square root of 7721379 is about 2778.7369432892. The cubic root of 7721379 is about 197.6506696238.

It can be divided in two parts, 7721 and 379, that added together give a square (8100 = 90²).

The spelling of 7721379 in words is "seven million, seven hundred twenty-one thousand, three hundred seventy-nine".