4991646 has 32 divisors (see below), whose sum is σ = 11104128. Its totient is φ = 1483040.

The previous prime is 4991617. The next prime is 4991647. The reversal of 4991646 is 6461994.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2785 + ... + 4211.

It is an arithmetic number, because the mean of its divisors is an integer number (347004).

Almost surely, 2^4991646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4991646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5552064).

4991646 is an abundant number, since it is smaller than the sum of its proper divisors (6112482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4991646 is a wasteful number, since it uses less digits than its factorization.

4991646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496.

The product of its digits is 46656, while the sum is 39.

The square root of 4991646 is about 2234.1991853906. The cubic root of 4991646 is about 170.9023073189.

It can be divided in two parts, 499 and 1646, that added together give a triangular number (2145 = T₆₅).

The spelling of 4991646 in words is "four million, nine hundred ninety-one thousand, six hundred forty-six".