2154305 has 4 divisors (see below), whose sum is σ = 2585172. Its totient is φ = 1723440.

The previous prime is 2154293. The next prime is 2154307. The reversal of 2154305 is 5034512.

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 430336 + 1723969 = 656^2 + 1313^2 .

It is not a de Polignac number, because 2154305 - 2⁶ = 2154241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215426 + ... + 215435.

It is an arithmetic number, because the mean of its divisors is an integer number (646293).

2^2154305 is an apocalyptic number.

It is an amenable number.

2154305 is a deficient number, since it is larger than the sum of its proper divisors (430867).

2154305 is an equidigital number, since it uses as much as digits as its factorization.

2154305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430866.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 2154305 is about 1467.7550885621. The cubic root of 2154305 is about 129.1523748784.

Adding to 2154305 its reverse (5034512), we get a palindrome (7188817).

The spelling of 2154305 in words is "two million, one hundred fifty-four thousand, three hundred five".