4000666 has 16 divisors (see below), whose sum is σ = 6480000. Its totient is φ = 1846768.

The previous prime is 4000651. The next prime is 4000669. The reversal of 4000666 is 6660004.

4000666 is a modest number, since divided by 666 gives 4 as remainder.

It is not an unprimeable number, because it can be changed into a prime (4000669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166 + ... + 2833.

It is an arithmetic number, because the mean of its divisors is an integer number (405000).

Almost surely, 2^4000666 is an apocalyptic number.

4000666 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

4000666 is a deficient number, since it is larger than the sum of its proper divisors (2479334).

4000666 is a wasteful number, since it uses less digits than its factorization.

4000666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 4000666 is about 2000.1664930700. The cubic root of 4000666 is about 158.7489147837.

The spelling of 4000666 in words is "four million, six hundred sixty-six", and thus it is an aban number.