138159738 has 24 divisors (see below), whose sum is σ = 300108276. Its totient is φ = 45936000.

The previous prime is 138159737. The next prime is 138159761. The reversal of 138159738 is 837951831.

138159738 is digitally balanced in base 3, 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 120494529 + 17665209 = 10977^2 + 4203^2 .

It is a super-2 number, since 2×138159738² = 38176226408457288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138159693 and 138159702.

It is not an unprimeable number, because it can be changed into a prime (138159737) 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 in 11 ways as a sum of consecutive naturals, for example, 2353 + ... + 16788.

Almost surely, 2^138159738 is an apocalyptic number.

138159738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138159738 is an abundant number, since it is smaller than the sum of its proper divisors (161948538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138159738 is a wasteful number, since it uses less digits than its factorization.

138159738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19550 (or 19547 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 138159738 is about 11754.1370589253. The cubic root of 138159738 is about 516.9642372318.

The spelling of 138159738 in words is "one hundred thirty-eight million, one hundred fifty-nine thousand, seven hundred thirty-eight".