42757729 has 4 divisors (see below), whose sum is σ = 48865984. Its totient is φ = 36649476.

The previous prime is 42757727. The next prime is 42757747. The reversal of 42757729 is 92775724.

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 42757729 - 2¹ = 42757727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42757721) 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, 3054117 + ... + 3054130.

It is an arithmetic number, because the mean of its divisors is an integer number (12216496).

Almost surely, 2^42757729 is an apocalyptic number.

It is an amenable number.

42757729 is a deficient number, since it is larger than the sum of its proper divisors (6108255).

42757729 is an equidigital number, since it uses as much as digits as its factorization.

42757729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6108254.

The product of its digits is 246960, while the sum is 43.

The square root of 42757729 is about 6538.9394400010. The cubic root of 42757729 is about 349.6806038585.

The spelling of 42757729 in words is "forty-two million, seven hundred fifty-seven thousand, seven hundred twenty-nine".