7721396 has 6 divisors (see below), whose sum is σ = 13512450. Its totient is φ = 3860696.

The previous prime is 7721393. The next prime is 7721401. The reversal of 7721396 is 6931277.

It can be written as a sum of positive squares in only one way, i.e., 7022500 + 698896 = 2650^2 + 836^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721393) 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 as a sum of consecutive naturals, namely, 965171 + ... + 965178.

It is an arithmetic number, because the mean of its divisors is an integer number (2252075).

Almost surely, 2^7721396 is an apocalyptic number.

It is an amenable number.

7721396 is a deficient number, since it is larger than the sum of its proper divisors (5791054).

7721396 is a wasteful number, since it uses less digits than its factorization.

7721396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930353 (or 1930351 counting only the distinct ones).

The product of its digits is 15876, while the sum is 35.

The square root of 7721396 is about 2778.7400022312. The cubic root of 7721396 is about 197.6508146781.

The spelling of 7721396 in words is "seven million, seven hundred twenty-one thousand, three hundred ninety-six".