7940666 has 8 divisors (see below), whose sum is σ = 12611700. Its totient is φ = 3736768.

The previous prime is 7940663. The next prime is 7940707. The reversal of 7940666 is 6660497.

It can be written as a sum of positive squares in 2 ways, for example, as 6325225 + 1615441 = 2515^2 + 1271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (7940663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116741 + ... + 116808.

Almost surely, 2^7940666 is an apocalyptic number.

7940666 is a deficient number, since it is larger than the sum of its proper divisors (4671034).

7940666 is a wasteful number, since it uses less digits than its factorization.

7940666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233568.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 7940666 is about 2817.9187355210. The cubic root of 7940666 is about 199.5043225341.

The spelling of 7940666 in words is "seven million, nine hundred forty thousand, six hundred sixty-six".