7721204 has 6 divisors (see below), whose sum is σ = 13512114. Its totient is φ = 3860600.

The previous prime is 7721191. The next prime is 7721249. The reversal of 7721204 is 4021277.

It can be written as a sum of positive squares in only one way, i.e., 4831204 + 2890000 = 2198^2 + 1700^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7721204.

It is a congruent number.

It is an unprimeable number.

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, 965147 + ... + 965154.

It is an arithmetic number, because the mean of its divisors is an integer number (2252019).

Almost surely, 2^7721204 is an apocalyptic number.

It is an amenable number.

7721204 is a deficient number, since it is larger than the sum of its proper divisors (5790910).

7721204 is a wasteful number, since it uses less digits than its factorization.

7721204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930305 (or 1930303 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 7721204 is about 2778.7054539839. The cubic root of 7721204 is about 197.6491764048.

The spelling of 7721204 in words is "seven million, seven hundred twenty-one thousand, two hundred four".