43257 has 4 divisors (see below), whose sum is σ = 57680. Its totient is φ = 28836.

The previous prime is 43237. The next prime is 43261. The reversal of 43257 is 75234.

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 43257 - 2¹² = 39161 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 43257.

It is not an unprimeable number, because it can be changed into a prime (43207) 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, 7207 + ... + 7212.

It is an arithmetic number, because the mean of its divisors is an integer number (14420).

2⁴³²⁵⁷ is an apocalyptic number.

It is an amenable number.

43257 is a deficient number, since it is larger than the sum of its proper divisors (14423).

43257 is a wasteful number, since it uses less digits than its factorization.

43257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14422.

The product of its digits is 840, while the sum is 21.

The square root of 43257 is about 207.9831723962. The cubic root of 43257 is about 35.1036383920.

It can be divided in two parts, 43 and 257, that added together give a triangular number (300 = T₂₄).

The spelling of 43257 in words is "forty-three thousand, two hundred fifty-seven".