42169729 has 8 divisors (see below), whose sum is σ = 48502208. Its totient is φ = 35914320.

The previous prime is 42169711. The next prime is 42169739. The reversal of 42169729 is 92796124.

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

It is a cyclic number.

It is not a de Polignac number, because 42169729 - 2¹⁹ = 41645441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42169691 and 42169700.

It is not an unprimeable number, because it can be changed into a prime (42169709) 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 7 ways as a sum of consecutive naturals, for example, 18087 + ... + 20284.

It is an arithmetic number, because the mean of its divisors is an integer number (6062776).

Almost surely, 2^42169729 is an apocalyptic number.

It is an amenable number.

42169729 is a deficient number, since it is larger than the sum of its proper divisors (6332479).

42169729 is a wasteful number, since it uses less digits than its factorization.

42169729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38535.

The product of its digits is 54432, while the sum is 40.

The square root of 42169729 is about 6493.8223720702. The cubic root of 42169729 is about 348.0702752558.

It can be divided in two parts, 4 and 2169729, that multiplied together give a square (8678916 = 2946²).

The spelling of 42169729 in words is "forty-two million, one hundred sixty-nine thousand, seven hundred twenty-nine".