3638681819 has 8 divisors (see below), whose sum is σ = 3853727280. Its totient is φ = 3423748096.

The previous prime is 3638681747. The next prime is 3638681821. The reversal of 3638681819 is 9181868363.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3638681819 - 2¹² = 3638677723 is a prime.

It is a super-2 number, since 2×3638681819² = 26480010759842297522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3638681119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44507 + ... + 96219.

It is an arithmetic number, because the mean of its divisors is an integer number (481715910).

Almost surely, 2^3638681819 is an apocalyptic number.

3638681819 is a deficient number, since it is larger than the sum of its proper divisors (215045461).

3638681819 is a wasteful number, since it uses less digits than its factorization.

3638681819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55869.

The product of its digits is 1492992, while the sum is 53.

The square root of 3638681819 is about 60321.4872081251. The cubic root of 3638681819 is about 1538.0886247655.

The spelling of 3638681819 in words is "three billion, six hundred thirty-eight million, six hundred eighty-one thousand, eight hundred nineteen".