2491128 has 64 divisors (see below), whose sum is σ = 7296000. Its totient is φ = 785376.

The previous prime is 2491123. The next prime is 2491171. The reversal of 2491128 is 8211942.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3801 + ... + 4407.

It is an arithmetic number, because the mean of its divisors is an integer number (114000).

2^2491128 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 2491128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3648000).

2491128 is an abundant number, since it is smaller than the sum of its proper divisors (4804872).

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

2491128 is a wasteful number, since it uses less digits than its factorization.

2491128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 631 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 2491128 is about 1578.3307638135. The cubic root of 2491128 is about 135.5601417820.

The spelling of 2491128 in words is "two million, four hundred ninety-one thousand, one hundred twenty-eight".