38642138 has 4 divisors (see below), whose sum is σ = 57963210. Its totient is φ = 19321068.

The previous prime is 38642137. The next prime is 38642159. The reversal of 38642138 is 83124683.

It is a happy number.

38642138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83124683 = 2237 ⋅37159.

It can be written as a sum of positive squares in only one way, i.e., 29235649 + 9406489 = 5407^2 + 3067^2 .

It is a super-2 number, since 2×38642138² = 2986429658422088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 38642098 and 38642107.

It is not an unprimeable number, because it can be changed into a prime (38642137) by changing a digit.

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 as a sum of consecutive naturals, namely, 9660533 + ... + 9660536.

Almost surely, 2^38642138 is an apocalyptic number.

38642138 is a deficient number, since it is larger than the sum of its proper divisors (19321072).

38642138 is a wasteful number, since it uses less digits than its factorization.

38642138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19321071.

The product of its digits is 27648, while the sum is 35.

The square root of 38642138 is about 6216.2800773453. The cubic root of 38642138 is about 338.0807026930.

It can be divided in two parts, 386 and 42138, that added together give a palindrome (42524).

The spelling of 38642138 in words is "thirty-eight million, six hundred forty-two thousand, one hundred thirty-eight".