3891663 has 12 divisors (see below), whose sum is σ = 5640960. Its totient is φ = 2585376.

The previous prime is 3891659. The next prime is 3891673. The reversal of 3891663 is 3661983.

It is a happy number.

It is not a de Polignac number, because 3891663 - 2² = 3891659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891673) 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, 2883 + ... + 4011.

It is an arithmetic number, because the mean of its divisors is an integer number (470080).

Almost surely, 2^3891663 is an apocalyptic number.

3891663 is a deficient number, since it is larger than the sum of its proper divisors (1749297).

3891663 is a wasteful number, since it uses less digits than its factorization.

3891663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518 (or 1515 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 3891663 is about 1972.7298345187. The cubic root of 3891663 is about 157.2938497151.

It can be divided in two parts, 3891 and 663, that added together give a palindrome (4554).

The spelling of 3891663 in words is "three million, eight hundred ninety-one thousand, six hundred sixty-three".