42729187 has 8 divisors (see below), whose sum is σ = 43211520. Its totient is φ = 42249480.

The previous prime is 42729139. The next prime is 42729217. The reversal of 42729187 is 78192724.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42729187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42729107) 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 7 ways as a sum of consecutive naturals, for example, 57138 + ... + 57880.

It is an arithmetic number, because the mean of its divisors is an integer number (5401440).

Almost surely, 2^42729187 is an apocalyptic number.

42729187 is a deficient number, since it is larger than the sum of its proper divisors (482333).

42729187 is a wasteful number, since it uses less digits than its factorization.

42729187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313.

The product of its digits is 56448, while the sum is 40.

The square root of 42729187 is about 6536.7566116538. The cubic root of 42729187 is about 349.6027792903.

The spelling of 42729187 in words is "forty-two million, seven hundred twenty-nine thousand, one hundred eighty-seven".