386984809 has 2 divisors, whose sum is σ = 386984810. Its totient is φ = 386984808.

The previous prime is 386984803. The next prime is 386984827. The reversal of 386984809 is 908489683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338376025 + 48608784 = 18395^2 + 6972^2 .

It is a cyclic number.

It is not a de Polignac number, because 386984809 - 2⁵ = 386984777 is a prime.

It is a super-3 number, since 3×386984809³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 386984809.

It is not a weakly prime, because it can be changed into another prime (386984803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193492404 + 193492405.

It is an arithmetic number, because the mean of its divisors is an integer number (193492405).

Almost surely, 2^386984809 is an apocalyptic number.

It is an amenable number.

386984809 is a deficient number, since it is larger than the sum of its proper divisors (1).

386984809 is an equidigital number, since it uses as much as digits as its factorization.

386984809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 386984809 is about 19671.9294681533. The cubic root of 386984809 is about 728.7266279047.

The spelling of 386984809 in words is "three hundred eighty-six million, nine hundred eighty-four thousand, eight hundred nine".