42729769 has 4 divisors (see below), whose sum is σ = 42747844. Its totient is φ = 42711696.

The previous prime is 42729763. The next prime is 42729779. The reversal of 42729769 is 96792724.

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 16104169 + 26625600 = 4013^2 + 5160^2 .

It is a cyclic number.

It is not a de Polignac number, because 42729769 - 2⁵ = 42729737 is a prime.

It is a super-2 number, since 2×42729769² = 3651666317586722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42729763) 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, 4842 + ... + 10435.

It is an arithmetic number, because the mean of its divisors is an integer number (10686961).

Almost surely, 2^42729769 is an apocalyptic number.

It is an amenable number.

42729769 is a deficient number, since it is larger than the sum of its proper divisors (18075).

42729769 is a wasteful number, since it uses less digits than its factorization.

42729769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18074.

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

The square root of 42729769 is about 6536.8011289927. The cubic root of 42729769 is about 349.6043665573.

It can be divided in two parts, 4272 and 9769, that added together give a palindrome (14041).

The spelling of 42729769 in words is "forty-two million, seven hundred twenty-nine thousand, seven hundred sixty-nine".