42769729 has 4 divisors (see below), whose sum is σ = 42788484. Its totient is φ = 42750976.

The previous prime is 42769717. The next prime is 42769777. The reversal of 42769729 is 92796724.

It is a happy number.

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 26286129 + 16483600 = 5127^2 + 4060^2 .

It is a cyclic number.

It is not a de Polignac number, because 42769729 - 2⁵ = 42769697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42769829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5392 + ... + 10705.

It is an arithmetic number, because the mean of its divisors is an integer number (10697121).

Almost surely, 2^42769729 is an apocalyptic number.

It is an amenable number.

42769729 is a deficient number, since it is larger than the sum of its proper divisors (18755).

42769729 is a wasteful number, since it uses less digits than its factorization.

42769729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18754.

The product of its digits is 381024, while the sum is 46.

The square root of 42769729 is about 6539.8569556222. The cubic root of 42769729 is about 349.7133135374.

The spelling of 42769729 in words is "forty-two million, seven hundred sixty-nine thousand, seven hundred twenty-nine".