2543445 has 24 divisors (see below), whose sum is σ = 4563000. Its totient is φ = 1309056.

The previous prime is 2543441. The next prime is 2543459. The reversal of 2543445 is 5443452.

It can be written as a sum of positive squares in 4 ways, for example, as 580644 + 1962801 = 762^2 + 1401^2 .

It is not a de Polignac number, because 2543445 - 2² = 2543441 is a prime.

It is a super-2 number, since 2×2543445² = 12938224936050, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁹ + 5³ + 4³ + 3⁵ + 4³ + 4⁸ + 5⁹ .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543441) 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 23 ways as a sum of consecutive naturals, for example, 331 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (190125).

2^2543445 is an apocalyptic number.

It is an amenable number.

2543445 is a deficient number, since it is larger than the sum of its proper divisors (2019555).

2543445 is a wasteful number, since it uses less digits than its factorization.

2543445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1986 counting only the distinct ones).

The product of its digits is 9600, while the sum is 27.

The square root of 2543445 is about 1594.8181714540. The cubic root of 2543445 is about 136.5025560041.

Adding to 2543445 its reverse (5443452), we get a palindrome (7986897).

The spelling of 2543445 in words is "two million, five hundred forty-three thousand, four hundred forty-five".