3969663 has 4 divisors (see below), whose sum is σ = 5292888. Its totient is φ = 2646440.

The previous prime is 3969659. The next prime is 3969673. The reversal of 3969663 is 3669693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3669693 = 3 ⋅1223231.

It is a cyclic number.

It is not a de Polignac number, because 3969663 - 2² = 3969659 is a prime.

It is a D-number.

3969663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3969673) 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, 661608 + ... + 661613.

It is an arithmetic number, because the mean of its divisors is an integer number (1323222).

Almost surely, 2^3969663 is an apocalyptic number.

3969663 is a deficient number, since it is larger than the sum of its proper divisors (1323225).

3969663 is a wasteful number, since it uses less digits than its factorization.

3969663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323224.

The product of its digits is 157464, while the sum is 42.

The square root of 3969663 is about 1992.4013149966. The cubic root of 3969663 is about 158.3377781455.

The spelling of 3969663 in words is "three million, nine hundred sixty-nine thousand, six hundred sixty-three".