7942666 has 4 divisors (see below), whose sum is σ = 11914002. Its totient is φ = 3971332.

The previous prime is 7942663. The next prime is 7942667. The reversal of 7942666 is 6662497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6662497 = 523 ⋅12739.

It can be written as a sum of positive squares in only one way, i.e., 7177041 + 765625 = 2679^2 + 875^2 .

It is not an unprimeable number, because it can be changed into a prime (7942663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985665 + ... + 1985668.

Almost surely, 2^7942666 is an apocalyptic number.

7942666 is a deficient number, since it is larger than the sum of its proper divisors (3971336).

7942666 is a wasteful number, since it uses less digits than its factorization.

7942666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971335.

The product of its digits is 108864, while the sum is 40.

The square root of 7942666 is about 2818.2735850162. The cubic root of 7942666 is about 199.5210707158.

The spelling of 7942666 in words is "seven million, nine hundred forty-two thousand, six hundred sixty-six".