389969209 has 8 divisors (see below), whose sum is σ = 465056640. Its totient is φ = 319726176.

The previous prime is 389969179. The next prime is 389969213. The reversal of 389969209 is 902969983.

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

It is not a de Polignac number, because 389969209 - 2¹⁵ = 389936441 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 389969209.

It is not an unprimeable number, because it can be changed into a prime (389969249) 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, 1210924 + ... + 1211245.

It is an arithmetic number, because the mean of its divisors is an integer number (58132080).

Almost surely, 2^389969209 is an apocalyptic number.

It is an amenable number.

389969209 is a deficient number, since it is larger than the sum of its proper divisors (75087431).

389969209 is a wasteful number, since it uses less digits than its factorization.

389969209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422199.

The product of its (nonzero) digits is 1889568, while the sum is 55.

The square root of 389969209 is about 19747.6380612974. The cubic root of 389969209 is about 730.5951292535.

It can be divided in two parts, 38996 and 9209, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 389969209 in words is "three hundred eighty-nine million, nine hundred sixty-nine thousand, two hundred nine".