4091666 has 4 divisors (see below), whose sum is σ = 6137502. Its totient is φ = 2045832.

The previous prime is 4091663. The next prime is 4091671. The reversal of 4091666 is 6661904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4084441 + 7225 = 2021^2 + 85^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (4091663) 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, 1022915 + ... + 1022918.

Almost surely, 2^4091666 is an apocalyptic number.

4091666 is a deficient number, since it is larger than the sum of its proper divisors (2045836).

4091666 is a wasteful number, since it uses less digits than its factorization.

4091666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045835.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 4091666 is about 2022.7866916707. The cubic root of 4091666 is about 159.9435477929.

The spelling of 4091666 in words is "four million, ninety-one thousand, six hundred sixty-six".