3899666 has 4 divisors (see below), whose sum is σ = 5849502. Its totient is φ = 1949832.

The previous prime is 3899657. The next prime is 3899699. The reversal of 3899666 is 6669983.

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., 2941225 + 958441 = 1715^2 + 979^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3899666.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974915 + ... + 974918.

Almost surely, 2^3899666 is an apocalyptic number.

3899666 is a deficient number, since it is larger than the sum of its proper divisors (1949836).

3899666 is a wasteful number, since it uses less digits than its factorization.

3899666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949835.

The product of its digits is 419904, while the sum is 47.

The square root of 3899666 is about 1974.7572002654. The cubic root of 3899666 is about 157.4015980618.

The spelling of 3899666 in words is "three million, eight hundred ninety-nine thousand, six hundred sixty-six".