2143445 has 16 divisors (see below), whose sum is σ = 2757888. Its totient is φ = 1593600.

The previous prime is 2143441. The next prime is 2143451. The reversal of 2143445 is 5443412.

It is not a de Polignac number, because 2143445 - 2² = 2143441 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 2143445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12752 + ... + 12918.

It is an arithmetic number, because the mean of its divisors is an integer number (172368).

2^2143445 is an apocalyptic number.

It is an amenable number.

2143445 is a deficient number, since it is larger than the sum of its proper divisors (614443).

2143445 is a wasteful number, since it uses less digits than its factorization.

2143445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340.

The product of its digits is 1920, while the sum is 23.

The square root of 2143445 is about 1464.0508870938. The cubic root of 2143445 is about 128.9349871713.

Adding to 2143445 its reverse (5443412), we get a palindrome (7586857).

The spelling of 2143445 in words is "two million, one hundred forty-three thousand, four hundred forty-five".