42729109 has 4 divisors (see below), whose sum is σ = 45242604. Its totient is φ = 40215616.

The previous prime is 42729107. The next prime is 42729131. The reversal of 42729109 is 90192724.

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 31606884 + 11122225 = 5622^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 42729109 - 2¹ = 42729107 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 (42729107) 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, 1256722 + ... + 1256755.

It is an arithmetic number, because the mean of its divisors is an integer number (11310651).

Almost surely, 2^42729109 is an apocalyptic number.

It is an amenable number.

42729109 is a deficient number, since it is larger than the sum of its proper divisors (2513495).

42729109 is a wasteful number, since it uses less digits than its factorization.

42729109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513494.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 42729109 is about 6536.7506453895. The cubic root of 42729109 is about 349.6025665626.

The spelling of 42729109 in words is "forty-two million, seven hundred twenty-nine thousand, one hundred nine".