52420209 has 4 divisors (see below), whose sum is σ = 69893616. Its totient is φ = 34946804.

The previous prime is 52420189. The next prime is 52420217. The reversal of 52420209 is 90202425.

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 52420209 - 2¹⁵ = 52387441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (52420229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8736699 + ... + 8736704.

It is an arithmetic number, because the mean of its divisors is an integer number (17473404).

Almost surely, 2^52420209 is an apocalyptic number.

It is an amenable number.

52420209 is a deficient number, since it is larger than the sum of its proper divisors (17473407).

52420209 is a wasteful number, since it uses less digits than its factorization.

52420209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17473406.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 52420209 is about 7240.1801773160. The cubic root of 52420209 is about 374.2538264738.

The spelling of 52420209 in words is "fifty-two million, four hundred twenty thousand, two hundred nine".