2391640 has 16 divisors (see below), whose sum is σ = 5381280. Its totient is φ = 956640.

The previous prime is 2391637. The next prime is 2391671. The reversal of 2391640 is 461932.

2391640 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 3 ways as a sum of consecutive naturals, for example, 29856 + ... + 29935.

It is an arithmetic number, because the mean of its divisors is an integer number (336330).

2^2391640 is an apocalyptic number.

2391640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2391640 is an abundant number, since it is smaller than the sum of its proper divisors (2989640).

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

2391640 is a wasteful number, since it uses less digits than its factorization.

2391640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59802 (or 59798 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 2391640 is about 1546.4928063202. The cubic root of 2391640 is about 133.7309519559.

The spelling of 2391640 in words is "two million, three hundred ninety-one thousand, six hundred forty".