380765209 has 4 divisors (see below), whose sum is σ = 415380240. Its totient is φ = 346150180.

The previous prime is 380765191. The next prime is 380765213. The reversal of 380765209 is 902567083.

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, and also an emirpimes, since its reverse is a distinct semiprime: 902567083 = 11 ⋅82051553.

It is a cyclic number.

It is not a de Polignac number, because 380765209 - 2⁷ = 380765081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (380765249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17307499 + ... + 17307520.

It is an arithmetic number, because the mean of its divisors is an integer number (103845060).

Almost surely, 2^380765209 is an apocalyptic number.

It is an amenable number.

380765209 is a deficient number, since it is larger than the sum of its proper divisors (34615031).

380765209 is a wasteful number, since it uses less digits than its factorization.

380765209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34615030.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 380765209 is about 19513.2060154143. The cubic root of 380765209 is about 724.8015050732.

The spelling of 380765209 in words is "three hundred eighty million, seven hundred sixty-five thousand, two hundred nine".