2491878 has 16 divisors (see below), whose sum is σ = 5011200. Its totient is φ = 826056.

The previous prime is 2491871. The next prime is 2491891. The reversal of 2491878 is 8781942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151 + ... + 2237.

It is an arithmetic number, because the mean of its divisors is an integer number (313200).

2^2491878 is an apocalyptic number.

2491878 is an abundant number, since it is smaller than the sum of its proper divisors (2519322).

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

2491878 is a wasteful number, since it uses less digits than its factorization.

2491878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291.

The product of its digits is 32256, while the sum is 39.

The square root of 2491878 is about 1578.5683387171. The cubic root of 2491878 is about 135.5737447100.

Subtracting 2491878 from its reverse (8781942), we obtain a square (6290064 = 2508²).

The spelling of 2491878 in words is "two million, four hundred ninety-one thousand, eight hundred seventy-eight".