43240253 has 8 divisors (see below), whose sum is σ = 51566208. Its totient is φ = 35451504.

The previous prime is 43240237. The next prime is 43240271. The reversal of 43240253 is 35204234.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43240253 - 2⁴ = 43240237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43240213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134126 + ... + 134447.

It is an arithmetic number, because the mean of its divisors is an integer number (6445776).

Almost surely, 2^43240253 is an apocalyptic number.

It is an amenable number.

43240253 is a deficient number, since it is larger than the sum of its proper divisors (8325955).

43240253 is a wasteful number, since it uses less digits than its factorization.

43240253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268603.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 43240253 is about 6575.7321265392. The cubic root of 43240253 is about 350.9910766854.

Adding to 43240253 its reverse (35204234), we get a palindrome (78444487).

The spelling of 43240253 in words is "forty-three million, two hundred forty thousand, two hundred fifty-three".