38631013138 has 4 divisors (see below), whose sum is σ = 57946519710. Its totient is φ = 19315506568.

The previous prime is 38631013121. The next prime is 38631013139. The reversal of 38631013138 is 83131013683.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24306992649 + 14324020489 = 155907^2 + 119683^2 .

It is a junction number, because it is equal to n+sod(n) for n = 38631013097 and 38631013106.

It is not an unprimeable number, because it can be changed into a prime (38631013139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9657753283 + ... + 9657753286.

Almost surely, 2^38631013138 is an apocalyptic number.

38631013138 is a deficient number, since it is larger than the sum of its proper divisors (19315506572).

38631013138 is a wasteful number, since it uses less digits than its factorization.

38631013138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19315506571.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 38631013138 in words is "thirty-eight billion, six hundred thirty-one million, thirteen thousand, one hundred thirty-eight".