380686409 has 4 divisors (see below), whose sum is σ = 397238016. Its totient is φ = 364134804.

The previous prime is 380686391. The next prime is 380686433. The reversal of 380686409 is 904686083.

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 not a de Polignac number, because 380686409 - 2¹⁶ = 380620873 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 380686409.

It is not an unprimeable number, because it can be changed into a prime (380686499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8275769 + ... + 8275814.

It is an arithmetic number, because the mean of its divisors is an integer number (99309504).

Almost surely, 2^380686409 is an apocalyptic number.

It is an amenable number.

380686409 is a deficient number, since it is larger than the sum of its proper divisors (16551607).

380686409 is a wasteful number, since it uses less digits than its factorization.

380686409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16551606.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 380686409 is about 19511.1867655456. The cubic root of 380686409 is about 724.7515019937.

The spelling of 380686409 in words is "three hundred eighty million, six hundred eighty-six thousand, four hundred nine".