42729447 has 8 divisors (see below), whose sum is σ = 57526144. Its totient is φ = 28209528.

The previous prime is 42729437. The next prime is 42729473. The reversal of 42729447 is 74492724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42729447 - 2¹² = 42725351 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 (42729437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68833 + ... + 69450.

It is an arithmetic number, because the mean of its divisors is an integer number (7190768).

Almost surely, 2^42729447 is an apocalyptic number.

42729447 is a deficient number, since it is larger than the sum of its proper divisors (14796697).

42729447 is a wasteful number, since it uses less digits than its factorization.

42729447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138389.

The product of its digits is 112896, while the sum is 39.

The square root of 42729447 is about 6536.7764991623. The cubic root of 42729447 is about 349.6034883804.

The spelling of 42729447 in words is "forty-two million, seven hundred twenty-nine thousand, four hundred forty-seven".