42543253 has 4 divisors (see below), whose sum is σ = 43915648. Its totient is φ = 41170860.

The previous prime is 42543187. The next prime is 42543269. The reversal of 42543253 is 35234524.

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 a cyclic number.

It is not a de Polignac number, because 42543253 - 2²⁵ = 8988821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42543653) 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, 686151 + ... + 686212.

It is an arithmetic number, because the mean of its divisors is an integer number (10978912).

Almost surely, 2^42543253 is an apocalyptic number.

It is an amenable number.

42543253 is a deficient number, since it is larger than the sum of its proper divisors (1372395).

42543253 is a wasteful number, since it uses less digits than its factorization.

42543253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372394.

The product of its digits is 14400, while the sum is 28.

The square root of 42543253 is about 6522.5189152658. The cubic root of 42543253 is about 349.0949487556.

Adding to 42543253 its reverse (35234524), we get a palindrome (77777777).

The spelling of 42543253 in words is "forty-two million, five hundred forty-three thousand, two hundred fifty-three".