43157 has 4 divisors (see below), whose sum is σ = 43680. Its totient is φ = 42636.

The previous prime is 43151. The next prime is 43159. The reversal of 43157 is 75134.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75134 = 2 ⋅37567.

It is a cyclic number.

It is not a de Polignac number, because 43157 - 2⁶ = 43093 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107 + ... + 312.

It is an arithmetic number, because the mean of its divisors is an integer number (10920).

2⁴³¹⁵⁷ is an apocalyptic number.

It is an amenable number.

43157 is a deficient number, since it is larger than the sum of its proper divisors (523).

43157 is a wasteful number, since it uses less digits than its factorization.

43157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522.

The product of its digits is 420, while the sum is 20.

The square root of 43157 is about 207.7426292315. The cubic root of 43157 is about 35.0765670713.

The spelling of 43157 in words is "forty-three thousand, one hundred fifty-seven".