138128132 has 6 divisors (see below), whose sum is σ = 241724238. Its totient is φ = 69064064.

The previous prime is 138128117. The next prime is 138128147. The reversal of 138128132 is 231821831.

It is an interprime number because it is at equal distance from previous prime (138128117) and next prime (138128147).

It can be written as a sum of positive squares in only one way, i.e., 136796416 + 1331716 = 11696^2 + 1154^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138128095 and 138128104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17266013 + ... + 17266020.

It is an arithmetic number, because the mean of its divisors is an integer number (40287373).

Almost surely, 2^138128132 is an apocalyptic number.

It is an amenable number.

138128132 is a deficient number, since it is larger than the sum of its proper divisors (103596106).

138128132 is a wasteful number, since it uses less digits than its factorization.

138128132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34532037 (or 34532035 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 138128132 is about 11752.7925192271. The cubic root of 138128132 is about 516.9248132577.

Adding to 138128132 its reverse (231821831), we get a palindrome (369949963).

The spelling of 138128132 in words is "one hundred thirty-eight million, one hundred twenty-eight thousand, one hundred thirty-two".