4009966 has 4 divisors (see below), whose sum is σ = 6014952. Its totient is φ = 2004982.

The previous prime is 4009939. The next prime is 4009991. The reversal of 4009966 is 6699004.

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

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002490 + ... + 1002493.

It is an arithmetic number, because the mean of its divisors is an integer number (1503738).

Almost surely, 2^4009966 is an apocalyptic number.

4009966 is a deficient number, since it is larger than the sum of its proper divisors (2004986).

4009966 is a wasteful number, since it uses less digits than its factorization.

4009966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004985.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 4009966 is about 2002.4899500372. The cubic root of 4009966 is about 158.8718295176.

The spelling of 4009966 in words is "four million, nine thousand, nine hundred sixty-six".