2640858 has 16 divisors (see below), whose sum is σ = 5762016. Its totient is φ = 800240.

The previous prime is 2640857. The next prime is 2640863. The reversal of 2640858 is 8580462.

2640858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (2640853) by changing a digit.

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, 19941 + ... + 20072.

It is an arithmetic number, because the mean of its divisors is an integer number (360126).

2^2640858 is an apocalyptic number.

2640858 is an abundant number, since it is smaller than the sum of its proper divisors (3121158).

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

2640858 is a wasteful number, since it uses less digits than its factorization.

2640858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40029.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 2640858 is about 1625.0716907263. The cubic root of 2640858 is about 138.2234355622.

The spelling of 2640858 in words is "two million, six hundred forty thousand, eight hundred fifty-eight".