7958866 has 4 divisors (see below), whose sum is σ = 11938302. Its totient is φ = 3979432.

The previous prime is 7958861. The next prime is 7958869. The reversal of 7958866 is 6688597.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6688597 = 1627 ⋅4111.

It can be written as a sum of positive squares in only one way, i.e., 7403841 + 555025 = 2721^2 + 745^2 .

It is not an unprimeable number, because it can be changed into a prime (7958861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989715 + ... + 1989718.

Almost surely, 2^7958866 is an apocalyptic number.

7958866 is a deficient number, since it is larger than the sum of its proper divisors (3979436).

7958866 is a wasteful number, since it uses less digits than its factorization.

7958866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3979435.

The product of its digits is 725760, while the sum is 49.

The square root of 7958866 is about 2821.1462209535. The cubic root of 7958866 is about 199.6566274806.

The spelling of 7958866 in words is "seven million, nine hundred fifty-eight thousand, eight hundred sixty-six".