7970821 has 2 divisors, whose sum is σ = 7970822. Its totient is φ = 7970820.

The previous prime is 7970801. The next prime is 7970827. The reversal of 7970821 is 1280797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7562500 + 408321 = 2750^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 7970821 - 2⁷ = 7970693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7970827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3985410 + 3985411.

It is an arithmetic number, because the mean of its divisors is an integer number (3985411).

Almost surely, 2^7970821 is an apocalyptic number.

It is an amenable number.

7970821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7970821 is an equidigital number, since it uses as much as digits as its factorization.

7970821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 7970821 is about 2823.2642455144. The cubic root of 7970821 is about 199.7565454363.

The spelling of 7970821 in words is "seven million, nine hundred seventy thousand, eight hundred twenty-one".