2155243 has 8 divisors (see below), whose sum is σ = 2307312. Its totient is φ = 2006016.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155243 is 3425512.

2155243 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 2155243 - 2⁹ = 2154731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155253) 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, 996 + ... + 2302.

It is an arithmetic number, because the mean of its divisors is an integer number (288414).

2^2155243 is an apocalyptic number.

2155243 is a deficient number, since it is larger than the sum of its proper divisors (152069).

2155243 is a wasteful number, since it uses less digits than its factorization.

2155243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its digits is 1200, while the sum is 22.

The square root of 2155243 is about 1468.0745893857. The cubic root of 2155243 is about 129.1711167851.

The spelling of 2155243 in words is "two million, one hundred fifty-five thousand, two hundred forty-three".