3999566 has 8 divisors (see below), whose sum is σ = 6016800. Its totient is φ = 1993968.

The previous prime is 3999563. The next prime is 3999577. The reversal of 3999566 is 6659993.

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

It is a self number, because there is not a number n which added to its sum of digits gives 3999566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999563) 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, 1991 + ... + 3458.

It is an arithmetic number, because the mean of its divisors is an integer number (752100).

Almost surely, 2^3999566 is an apocalyptic number.

3999566 is a deficient number, since it is larger than the sum of its proper divisors (2017234).

3999566 is a wasteful number, since it uses less digits than its factorization.

3999566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5818.

The product of its digits is 393660, while the sum is 47.

The square root of 3999566 is about 1999.8914970568. The cubic root of 3999566 is about 158.7343638887.

The spelling of 3999566 in words is "three million, nine hundred ninety-nine thousand, five hundred sixty-six".