2143305 has 12 divisors (see below), whose sum is σ = 3715140. Its totient is φ = 1143072.

The previous prime is 2143279. The next prime is 2143313. The reversal of 2143305 is 5033412.

It can be written as a sum of positive squares in 2 ways, for example, as 767376 + 1375929 = 876^2 + 1173^2 .

It is not a de Polignac number, because 2143305 - 2⁷ = 2143177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23770 + ... + 23859.

It is an arithmetic number, because the mean of its divisors is an integer number (309595).

2^2143305 is an apocalyptic number.

It is an amenable number.

2143305 is a deficient number, since it is larger than the sum of its proper divisors (1571835).

2143305 is a wasteful number, since it uses less digits than its factorization.

2143305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47640 (or 47637 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 2143305 is about 1464.0030737673. The cubic root of 2143305 is about 128.9321799628.

Adding to 2143305 its reverse (5033412), we get a palindrome (7176717).

The spelling of 2143305 in words is "two million, one hundred forty-three thousand, three hundred five".