42809569 has 4 divisors (see below), whose sum is σ = 46701360. Its totient is φ = 38917780.

The previous prime is 42809567. The next prime is 42809573. The reversal of 42809569 is 96590824.

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 not a de Polignac number, because 42809569 - 2¹ = 42809567 is a prime.

It is a super-2 number, since 2×42809569² = 3665318395931522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42809561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1945879 + ... + 1945900.

It is an arithmetic number, because the mean of its divisors is an integer number (11675340).

Almost surely, 2^42809569 is an apocalyptic number.

It is an amenable number.

42809569 is a deficient number, since it is larger than the sum of its proper divisors (3891791).

42809569 is a wasteful number, since it uses less digits than its factorization.

42809569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3891790.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 42809569 is about 6542.9021848107. The cubic root of 42809569 is about 349.8218658157.

The spelling of 42809569 in words is "forty-two million, eight hundred nine thousand, five hundred sixty-nine".