7825921 has 2 divisors, whose sum is σ = 7825922. Its totient is φ = 7825920.

The previous prime is 7825903. The next prime is 7825943. The reversal of 7825921 is 1295287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7756225 + 69696 = 2785^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 7825921 - 2⁵ = 7825889 is a prime.

It is a super-2 number, since 2×7825921² = 122490078996482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7825991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3912960 + 3912961.

It is an arithmetic number, because the mean of its divisors is an integer number (3912961).

Almost surely, 2^7825921 is an apocalyptic number.

It is an amenable number.

7825921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7825921 is an equidigital number, since it uses as much as digits as its factorization.

7825921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 7825921 is about 2797.4847631399. The cubic root of 7825921 is about 198.5386905444.

The spelling of 7825921 in words is "seven million, eight hundred twenty-five thousand, nine hundred twenty-one".