42552809 has 8 divisors (see below), whose sum is σ = 46120200. Its totient is φ = 39027456.

The previous prime is 42552791. The next prime is 42552817. The reversal of 42552809 is 90825524.

It is a happy number.

42552809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4853209 + 37699600 = 2203^2 + 6140^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-42552809 is a prime.

It is a super-3 number, since 3×42552809³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42552859) 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 7 ways as a sum of consecutive naturals, for example, 8384 + ... + 12465.

It is an arithmetic number, because the mean of its divisors is an integer number (5765025).

Almost surely, 2^42552809 is an apocalyptic number.

It is an amenable number.

42552809 is a deficient number, since it is larger than the sum of its proper divisors (3567391).

42552809 is a wasteful number, since it uses less digits than its factorization.

42552809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21019.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 42552809 is about 6523.2514132141. The cubic root of 42552809 is about 349.1210845222.

The spelling of 42552809 in words is "forty-two million, five hundred fifty-two thousand, eight hundred nine".