42809969 has 4 divisors (see below), whose sum is σ = 44671296. Its totient is φ = 40948644.

The previous prime is 42809959. The next prime is 42809971. The reversal of 42809969 is 96990824.

42809969 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 42809969 - 2⁴ = 42809953 is a prime.

It is a super-2 number, since 2×42809969² = 3665386891561922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42809929) 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, 930629 + ... + 930674.

It is an arithmetic number, because the mean of its divisors is an integer number (11167824).

Almost surely, 2^42809969 is an apocalyptic number.

It is an amenable number.

42809969 is a deficient number, since it is larger than the sum of its proper divisors (1861327).

42809969 is a wasteful number, since it uses less digits than its factorization.

42809969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861326.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 42809969 is about 6542.9327522144. The cubic root of 42809969 is about 349.8229553565.

The spelling of 42809969 in words is "forty-two million, eight hundred nine thousand, nine hundred sixty-nine".