7806641 has 2 divisors, whose sum is σ = 7806642. Its totient is φ = 7806640.

The previous prime is 7806619. The next prime is 7806647. The reversal of 7806641 is 1466087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7134241 + 672400 = 2671^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 7806641 - 2⁶ = 7806577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7806598 and 7806607.

It is not a weakly prime, because it can be changed into another prime (7806647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3903320 + 3903321.

It is an arithmetic number, because the mean of its divisors is an integer number (3903321).

Almost surely, 2^7806641 is an apocalyptic number.

It is an amenable number.

7806641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7806641 is an equidigital number, since it uses as much as digits as its factorization.

7806641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 7806641 is about 2794.0366855143. The cubic root of 7806641 is about 198.3755159828.

The spelling of 7806641 in words is "seven million, eight hundred six thousand, six hundred forty-one".