42912169 has 4 divisors (see below), whose sum is σ = 43328896. Its totient is φ = 42495444.

The previous prime is 42912143. The next prime is 42912179. The reversal of 42912169 is 96121924.

42912169 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42912169 - 2⁵ = 42912137 is a prime.

It is a super-4 number, since 4×42912169⁴ (a number of 32 digits) contains 4444 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 (42912179) 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, 208209 + ... + 208414.

It is an arithmetic number, because the mean of its divisors is an integer number (10832224).

Almost surely, 2^42912169 is an apocalyptic number.

It is an amenable number.

42912169 is a deficient number, since it is larger than the sum of its proper divisors (416727).

42912169 is a wasteful number, since it uses less digits than its factorization.

42912169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416726.

The product of its digits is 7776, while the sum is 34.

The square root of 42912169 is about 6550.7380500215. The cubic root of 42912169 is about 350.1011109235.

The spelling of 42912169 in words is "forty-two million, nine hundred twelve thousand, one hundred sixty-nine".