381636309 has 32 divisors (see below), whose sum is σ = 546416640. Its totient is φ = 236351808.

The previous prime is 381636293. The next prime is 381636329. The reversal of 381636309 is 903636183.

It is not a de Polignac number, because 381636309 - 2⁴ = 381636293 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381636329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 869112 + ... + 869550.

It is an arithmetic number, because the mean of its divisors is an integer number (17075520).

Almost surely, 2^381636309 is an apocalyptic number.

It is an amenable number.

381636309 is a deficient number, since it is larger than the sum of its proper divisors (164780331).

381636309 is a wasteful number, since it uses less digits than its factorization.

381636309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 381636309 is about 19535.5140449388. The cubic root of 381636309 is about 725.3538084428.

The spelling of 381636309 in words is "three hundred eighty-one million, six hundred thirty-six thousand, three hundred nine".