4018666 has 4 divisors (see below), whose sum is σ = 6028002. Its totient is φ = 2009332.

The previous prime is 4018649. The next prime is 4018699. The reversal of 4018666 is 6668104.

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., 2117025 + 1901641 = 1455^2 + 1379^2 .

It is a super-2 number, since 2×4018666² = 32299352839112, which contains 22 as substring.

It is an unprimeable number.

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, 1004665 + ... + 1004668.

Almost surely, 2^4018666 is an apocalyptic number.

4018666 is a deficient number, since it is larger than the sum of its proper divisors (2009336).

4018666 is a wasteful number, since it uses less digits than its factorization.

4018666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009335.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 4018666 is about 2004.6610686099. The cubic root of 4018666 is about 158.9866423387.

The spelling of 4018666 in words is "four million, eighteen thousand, six hundred sixty-six".