43040253 has 4 divisors (see below), whose sum is σ = 57387008. Its totient is φ = 28693500.

The previous prime is 43040251. The next prime is 43040299. The reversal of 43040253 is 35204034.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 43040253 - 2¹ = 43040251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43040251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7173373 + ... + 7173378.

It is an arithmetic number, because the mean of its divisors is an integer number (14346752).

Almost surely, 2^43040253 is an apocalyptic number.

It is an amenable number.

43040253 is a deficient number, since it is larger than the sum of its proper divisors (14346755).

43040253 is a wasteful number, since it uses less digits than its factorization.

43040253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14346754.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 43040253 is about 6560.5070688172. The cubic root of 43040253 is about 350.4490915430.

Adding to 43040253 its reverse (35204034), we get a palindrome (78244287).

The spelling of 43040253 in words is "forty-three million, forty thousand, two hundred fifty-three".