3999663 has 12 divisors (see below), whose sum is σ = 5933928. Its totient is φ = 2594160.

The previous prime is 3999661. The next prime is 3999683. The reversal of 3999663 is 3669993.

It is not a de Polignac number, because 3999663 - 2¹ = 3999661 is a prime.

It is a super-2 number, since 2×3999663² = 31994608227138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5673 + ... + 6338.

It is an arithmetic number, because the mean of its divisors is an integer number (494494).

Almost surely, 2^3999663 is an apocalyptic number.

3999663 is a deficient number, since it is larger than the sum of its proper divisors (1934265).

3999663 is a wasteful number, since it uses less digits than its factorization.

3999663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12054 (or 12051 counting only the distinct ones).

The product of its digits is 236196, while the sum is 45.

The square root of 3999663 is about 1999.9157482254. The cubic root of 3999663 is about 158.7356471203.

The spelling of 3999663 in words is "three million, nine hundred ninety-nine thousand, six hundred sixty-three".