2154205 has 4 divisors (see below), whose sum is σ = 2585052. Its totient is φ = 1723360.

The previous prime is 2154193. The next prime is 2154209. The reversal of 2154205 is 5024512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 840889 + 1313316 = 917^2 + 1146^2 .

It is not a de Polignac number, because 2154205 - 2⁷ = 2154077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215416 + ... + 215425.

It is an arithmetic number, because the mean of its divisors is an integer number (646263).

2^2154205 is an apocalyptic number.

It is an amenable number.

2154205 is a deficient number, since it is larger than the sum of its proper divisors (430847).

2154205 is an equidigital number, since it uses as much as digits as its factorization.

2154205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430846.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2154205 is about 1467.7210225380. The cubic root of 2154205 is about 129.1503764865.

Adding to 2154205 its reverse (5024512), we get a palindrome (7178717).

The spelling of 2154205 in words is "two million, one hundred fifty-four thousand, two hundred five".