38631818 has 8 divisors (see below), whose sum is σ = 58188900. Its totient is φ = 19235520.

The previous prime is 38631809. The next prime is 38631821. The reversal of 38631818 is 81813683.

38631818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 31730689 + 6901129 = 5633^2 + 2627^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39593 + ... + 40556.

Almost surely, 2^38631818 is an apocalyptic number.

38631818 is a deficient number, since it is larger than the sum of its proper divisors (19557082).

38631818 is a wasteful number, since it uses less digits than its factorization.

38631818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80392.

The product of its digits is 27648, while the sum is 38.

The square root of 38631818 is about 6215.4499434876. The cubic root of 38631818 is about 338.0506033966.

The spelling of 38631818 in words is "thirty-eight million, six hundred thirty-one thousand, eight hundred eighteen".