189398809 has 4 divisors (see below), whose sum is σ = 195508480. Its totient is φ = 183289140.

The previous prime is 189398773. The next prime is 189398837. The reversal of 189398809 is 908893981.

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 189398809 - 2¹¹ = 189396761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189398809.

It is not an unprimeable number, because it can be changed into a prime (189398879) 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, 3054789 + ... + 3054850.

It is an arithmetic number, because the mean of its divisors is an integer number (48877120).

Almost surely, 2^189398809 is an apocalyptic number.

It is an amenable number.

189398809 is a deficient number, since it is larger than the sum of its proper divisors (6109671).

189398809 is an equidigital number, since it uses as much as digits as its factorization.

189398809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6109670.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 189398809 is about 13762.2239845165. The cubic root of 189398809 is about 574.2827189617.

The spelling of 189398809 in words is "one hundred eighty-nine million, three hundred ninety-eight thousand, eight hundred nine".