2491658 has 16 divisors (see below), whose sum is σ = 4112640. Its totient is φ = 1124976.

The previous prime is 2491649. The next prime is 2491661. The reversal of 2491658 is 8561942.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203 + ... + 2241.

It is an arithmetic number, because the mean of its divisors is an integer number (257040).

2^2491658 is an apocalyptic number.

2491658 is a deficient number, since it is larger than the sum of its proper divisors (1620982).

2491658 is a wasteful number, since it uses less digits than its factorization.

2491658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101.

The product of its digits is 17280, while the sum is 35.

The square root of 2491658 is about 1578.4986537847. The cubic root of 2491658 is about 135.5697548007.

The spelling of 2491658 in words is "two million, four hundred ninety-one thousand, six hundred fifty-eight".