2155445 has 8 divisors (see below), whose sum is σ = 2699136. Its totient is φ = 1649296.

The previous prime is 2155429. The next prime is 2155451. The reversal of 2155445 is 5445512.

2155445 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 a cyclic number.

It is not a de Polignac number, because 2155445 - 2⁴ = 2155429 is a prime.

It is an Ulam number.

It is a Duffinian number.

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, 9257 + ... + 9486.

It is an arithmetic number, because the mean of its divisors is an integer number (337392).

2^2155445 is an apocalyptic number.

It is an amenable number.

2155445 is a deficient number, since it is larger than the sum of its proper divisors (543691).

2155445 is a wasteful number, since it uses less digits than its factorization.

2155445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18771.

The product of its digits is 4000, while the sum is 26.

The square root of 2155445 is about 1468.1433853681. The cubic root of 2155445 is about 129.1751521770.

The spelling of 2155445 in words is "two million, one hundred fifty-five thousand, four hundred forty-five".