42257143 has 4 divisors (see below), whose sum is σ = 42280168. Its totient is φ = 42234120.

The previous prime is 42257129. The next prime is 42257161. The reversal of 42257143 is 34175224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42257143 - 2⁹ = 42256631 is a prime.

It is a super-2 number, since 2×42257143² = 3571332269044898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42254143) 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, 8496 + ... + 12517.

It is an arithmetic number, because the mean of its divisors is an integer number (10570042).

Almost surely, 2^42257143 is an apocalyptic number.

42257143 is a deficient number, since it is larger than the sum of its proper divisors (23025).

42257143 is a wasteful number, since it uses less digits than its factorization.

42257143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23024.

The product of its digits is 6720, while the sum is 28.

The square root of 42257143 is about 6500.5494383167. The cubic root of 42257143 is about 348.3106152371.

The spelling of 42257143 in words is "forty-two million, two hundred fifty-seven thousand, one hundred forty-three".