42729173 has 4 divisors (see below), whose sum is σ = 42751788. Its totient is φ = 42706560.

The previous prime is 42729139. The next prime is 42729217. The reversal of 42729173 is 37192724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22819729 + 19909444 = 4777^2 + 4462^2 .

It is a cyclic number.

It is not a de Polignac number, because 42729173 - 2¹² = 42725077 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 (42729473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8186 + ... + 12347.

It is an arithmetic number, because the mean of its divisors is an integer number (10687947).

Almost surely, 2^42729173 is an apocalyptic number.

It is an amenable number.

42729173 is a deficient number, since it is larger than the sum of its proper divisors (22615).

42729173 is a wasteful number, since it uses less digits than its factorization.

42729173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22614.

The product of its digits is 21168, while the sum is 35.

The square root of 42729173 is about 6536.7555407863. The cubic root of 42729173 is about 349.6027411084.

The spelling of 42729173 in words is "forty-two million, seven hundred twenty-nine thousand, one hundred seventy-three".