43240257 has 32 divisors (see below), whose sum is σ = 69632000. Its totient is φ = 26418960.

The previous prime is 43240237. The next prime is 43240271. The reversal of 43240257 is 75204234.

It is not a de Polignac number, because 43240257 - 2¹⁰ = 43239233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43240257.

It is not an unprimeable number, because it can be changed into a prime (43240237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14544 + ... + 17262.

It is an arithmetic number, because the mean of its divisors is an integer number (2176000).

Almost surely, 2^43240257 is an apocalyptic number.

It is an amenable number.

43240257 is a deficient number, since it is larger than the sum of its proper divisors (26391743).

43240257 is a wasteful number, since it uses less digits than its factorization.

43240257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778 (or 2772 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 43240257 is about 6575.7324306879. The cubic root of 43240257 is about 350.9910875084.

The spelling of 43240257 in words is "forty-three million, two hundred forty thousand, two hundred fifty-seven".