42040169 has 4 divisors (see below), whose sum is σ = 43489860. Its totient is φ = 40590480.

The previous prime is 42040157. The next prime is 42040199. The reversal of 42040169 is 96104024.

42040169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 32035600 + 10004569 = 5660^2 + 3163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42040169 is a prime.

It is a super-3 number, since 3×42040169³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42040109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724802 + ... + 724859.

It is an arithmetic number, because the mean of its divisors is an integer number (10872465).

Almost surely, 2^42040169 is an apocalyptic number.

It is an amenable number.

42040169 is a deficient number, since it is larger than the sum of its proper divisors (1449691).

42040169 is a wasteful number, since it uses less digits than its factorization.

42040169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449690.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 42040169 is about 6483.8390633945. The cubic root of 42040169 is about 347.7134454602.

The spelling of 42040169 in words is "forty-two million, forty thousand, one hundred sixty-nine".