7676821 has 2 divisors, whose sum is σ = 7676822. Its totient is φ = 7676820.

The previous prime is 7676819. The next prime is 7676827. The reversal of 7676821 is 1286767.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5574321 + 2102500 = 2361^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 7676821 - 2¹ = 7676819 is a prime.

Together with 7676819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7676827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3838410 + 3838411.

It is an arithmetic number, because the mean of its divisors is an integer number (3838411).

Almost surely, 2^7676821 is an apocalyptic number.

It is an amenable number.

7676821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7676821 is an equidigital number, since it uses as much as digits as its factorization.

7676821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 7676821 is about 2770.7076713360. The cubic root of 7676821 is about 197.2697396611.

The spelling of 7676821 in words is "seven million, six hundred seventy-six thousand, eight hundred twenty-one".