2391664 has 40 divisors (see below), whose sum is σ = 5142528. Its totient is φ = 1068480.

The previous prime is 2391637. The next prime is 2391671. The reversal of 2391664 is 4661932.

2391664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18769 + ... + 18895.

2^2391664 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 2391664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2571264).

2391664 is an abundant number, since it is smaller than the sum of its proper divisors (2750864).

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

2391664 is a wasteful number, since it uses less digits than its factorization.

2391664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 247 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 2391664 is about 1546.5005657936. The cubic root of 2391664 is about 133.7313992825.

The spelling of 2391664 in words is "two million, three hundred ninety-one thousand, six hundred sixty-four".