40002543 has 48 divisors (see below), whose sum is σ = 72583680. Its totient is φ = 20699712.

The previous prime is 40002491. The next prime is 40002559. The reversal of 40002543 is 34520004.

40002543 = 57² + 58² + ... + 493².

It is a happy number.

It is not a de Polignac number, because 40002543 - 2¹⁰ = 40001519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40002583) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26805 + ... + 28257.

It is an arithmetic number, because the mean of its divisors is an integer number (1512160).

Almost surely, 2^40002543 is an apocalyptic number.

40002543 is a deficient number, since it is larger than the sum of its proper divisors (32581137).

40002543 is a wasteful number, since it uses less digits than its factorization.

40002543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 40002543 is about 6324.7563589438. The cubic root of 40002543 is about 342.0024366298.

Adding to 40002543 its reverse (34520004), we get a palindrome (74522547).

The spelling of 40002543 in words is "forty million, two thousand, five hundred forty-three".