2155645 has 8 divisors (see below), whose sum is σ = 2723040. Its totient is φ = 1633680.

The previous prime is 2155639. The next prime is 2155661. The reversal of 2155645 is 5465512.

2155645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2155645 - 2⁵ = 2155613 is a prime.

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, 11251 + ... + 11440.

It is an arithmetic number, because the mean of its divisors is an integer number (340380).

2^2155645 is an apocalyptic number.

It is an amenable number.

2155645 is a deficient number, since it is larger than the sum of its proper divisors (567395).

2155645 is a wasteful number, since it uses less digits than its factorization.

2155645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22715.

The product of its digits is 6000, while the sum is 28.

The square root of 2155645 is about 1468.2114970262. The cubic root of 2155645 is about 129.1791473661.

The spelling of 2155645 in words is "two million, one hundred fifty-five thousand, six hundred forty-five".