7939661 has 2 divisors, whose sum is σ = 7939662. Its totient is φ = 7939660.

The previous prime is 7939643. The next prime is 7939693. The reversal of 7939661 is 1669397.

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., 7806436 + 133225 = 2794^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 7939661 - 2⁶ = 7939597 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7939621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969830 + 3969831.

It is an arithmetic number, because the mean of its divisors is an integer number (3969831).

Almost surely, 2^7939661 is an apocalyptic number.

It is an amenable number.

7939661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7939661 is an equidigital number, since it uses as much as digits as its factorization.

7939661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 41.

The square root of 7939661 is about 2817.7404067799. The cubic root of 7939661 is about 199.4959055112.

The spelling of 7939661 in words is "seven million, nine hundred thirty-nine thousand, six hundred sixty-one".