7958861 has 2 divisors, whose sum is σ = 7958862. Its totient is φ = 7958860.

The previous prime is 7958857. The next prime is 7958869. The reversal of 7958861 is 1688597.

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., 7946761 + 12100 = 2819^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 7958861 - 2² = 7958857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7958869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3979430 + 3979431.

It is an arithmetic number, because the mean of its divisors is an integer number (3979431).

Almost surely, 2^7958861 is an apocalyptic number.

It is an amenable number.

7958861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7958861 is an equidigital number, since it uses as much as digits as its factorization.

7958861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 44.

The square root of 7958861 is about 2821.1453347887. The cubic root of 7958861 is about 199.6565856705.

The spelling of 7958861 in words is "seven million, nine hundred fifty-eight thousand, eight hundred sixty-one".