209428899 has 16 divisors (see below), whose sum is σ = 296527392. Its totient is φ = 131022848.

The previous prime is 209428883. The next prime is 209428907. The reversal of 209428899 is 998824902.

It is a cyclic number.

It is not a de Polignac number, because 209428899 - 2⁴ = 209428883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (209428699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12187 + ... + 23819.

It is an arithmetic number, because the mean of its divisors is an integer number (18532962).

Almost surely, 2^209428899 is an apocalyptic number.

209428899 is a deficient number, since it is larger than the sum of its proper divisors (87098493).

209428899 is a wasteful number, since it uses less digits than its factorization.

209428899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12006.

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 209428899 is about 14471.6584744113. The cubic root of 209428899 is about 593.8528839037.

The spelling of 209428899 in words is "two hundred nine million, four hundred twenty-eight thousand, eight hundred ninety-nine".