3998663 has 4 divisors (see below), whose sum is σ = 4014480. Its totient is φ = 3982848.

The previous prime is 3998653. The next prime is 3998669. The reversal of 3998663 is 3668993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3668993 = 29 ⋅126517.

It is a cyclic number.

It is not a de Polignac number, because 3998663 - 2¹⁰ = 3997639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998669) 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, 7523 + ... + 8036.

It is an arithmetic number, because the mean of its divisors is an integer number (1003620).

Almost surely, 2^3998663 is an apocalyptic number.

3998663 is a deficient number, since it is larger than the sum of its proper divisors (15817).

3998663 is a wasteful number, since it uses less digits than its factorization.

3998663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15816.

The product of its digits is 209952, while the sum is 44.

The square root of 3998663 is about 1999.6657220646. The cubic root of 3998663 is about 158.7224169325.

The spelling of 3998663 in words is "three million, nine hundred ninety-eight thousand, six hundred sixty-three".