386540809 has 4 divisors (see below), whose sum is σ = 386621440. Its totient is φ = 386460180.

The previous prime is 386540773. The next prime is 386540839. The reversal of 386540809 is 908045683.

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 386540809 - 2¹³ = 386532617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (386540839) 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, 32637 + ... + 42874.

It is an arithmetic number, because the mean of its divisors is an integer number (96655360).

Almost surely, 2^386540809 is an apocalyptic number.

It is an amenable number.

386540809 is a deficient number, since it is larger than the sum of its proper divisors (80631).

386540809 is an equidigital number, since it uses as much as digits as its factorization.

386540809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80630.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 386540809 is about 19660.6411136565. The cubic root of 386540809 is about 728.4478241586.

The spelling of 386540809 in words is "three hundred eighty-six million, five hundred forty thousand, eight hundred nine".