2491668 has 24 divisors (see below), whose sum is σ = 6460160. Its totient is φ = 830520.

The previous prime is 2491661. The next prime is 2491669. The reversal of 2491668 is 8661942.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491661) by changing a digit.

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, 11428 + ... + 11643.

2^2491668 is an apocalyptic number.

It is an amenable number.

2491668 is an abundant number, since it is smaller than the sum of its proper divisors (3968492).

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

2491668 is a wasteful number, since it uses less digits than its factorization.

2491668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23084 (or 23076 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 2491668 is about 1578.5018213483. The cubic root of 2491668 is about 135.5699361653.

The spelling of 2491668 in words is "two million, four hundred ninety-one thousand, six hundred sixty-eight".