2145305 has 8 divisors (see below), whose sum is σ = 2597832. Its totient is φ = 1700608.

The previous prime is 2145289. The next prime is 2145307. The reversal of 2145305 is 5035412.

It can be written as a sum of positive squares in 4 ways, for example, as 238144 + 1907161 = 488^2 + 1381^2 .

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 2145305 - 2⁴ = 2145289 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (2145307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1334 + ... + 2463.

It is an arithmetic number, because the mean of its divisors is an integer number (324729).

2^2145305 is an apocalyptic number.

It is an amenable number.

2145305 is a deficient number, since it is larger than the sum of its proper divisors (452527).

2145305 is a wasteful number, since it uses less digits than its factorization.

2145305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915.

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

The square root of 2145305 is about 1464.6859731697. The cubic root of 2145305 is about 128.9722713472.

The spelling of 2145305 in words is "two million, one hundred forty-five thousand, three hundred five".