4991868 has 120 divisors (see below), whose sum is σ = 15611904. Its totient is φ = 1360800.

The previous prime is 4991867. The next prime is 4991879. The reversal of 4991868 is 8681994.

It is a super-2 number, since 2×4991868² = 49837492258848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991867) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70273 + ... + 70343.

Almost surely, 2^4991868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4991868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7805952).

4991868 is an abundant number, since it is smaller than the sum of its proper divisors (10620036).

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

4991868 is a wasteful number, since it uses less digits than its factorization.

4991868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 114 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 4991868 is about 2234.2488670692. The cubic root of 4991868 is about 170.9048408686.

The spelling of 4991868 in words is "four million, nine hundred ninety-one thousand, eight hundred sixty-eight".