2491890 has 16 divisors (see below), whose sum is σ = 5980608. Its totient is φ = 664496.

The previous prime is 2491871. The next prime is 2491891. The reversal of 2491890 is 981942.

It is not an unprimeable number, because it can be changed into a prime (2491891) 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, 41502 + ... + 41561.

It is an arithmetic number, because the mean of its divisors is an integer number (373788).

2^2491890 is an apocalyptic number.

2491890 is an abundant number, since it is smaller than the sum of its proper divisors (3488718).

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

2491890 is a wasteful number, since it uses less digits than its factorization.

2491890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83073.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 2491890 is about 1578.5721396249. The cubic root of 2491890 is about 135.5739623347.

The spelling of 2491890 in words is "two million, four hundred ninety-one thousand, eight hundred ninety".