200428209 has 8 divisors (see below), whose sum is σ = 296930720. Its totient is φ = 133618788.

The previous prime is 200428183. The next prime is 200428211. The reversal of 200428209 is 902824002.

It is not a de Polignac number, because 200428209 - 2⁵ = 200428177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7423267 = 200428209 / (2 + 0 + 0 + 4 + 2 + 8 + 2 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200424209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3711607 + ... + 3711660.

It is an arithmetic number, because the mean of its divisors is an integer number (37116340).

Almost surely, 2^200428209 is an apocalyptic number.

It is an amenable number.

200428209 is a deficient number, since it is larger than the sum of its proper divisors (96502511).

200428209 is an equidigital number, since it uses as much as digits as its factorization.

200428209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7423276 (or 7423270 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 200428209 is about 14157.2670032037. The cubic root of 200428209 is about 585.2206137022.

The spelling of 200428209 in words is "two hundred million, four hundred twenty-eight thousand, two hundred nine".