138681332 has 6 divisors (see below), whose sum is σ = 242692338. Its totient is φ = 69340664.

The previous prime is 138681317. The next prime is 138681353. The reversal of 138681332 is 233186831.

It can be written as a sum of positive squares in only one way, i.e., 85303696 + 53377636 = 9236^2 + 7306^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138681292 and 138681301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17335163 + ... + 17335170.

It is an arithmetic number, because the mean of its divisors is an integer number (40448723).

Almost surely, 2^138681332 is an apocalyptic number.

It is an amenable number.

138681332 is a deficient number, since it is larger than the sum of its proper divisors (104011006).

138681332 is a wasteful number, since it uses less digits than its factorization.

138681332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34670337 (or 34670335 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 138681332 is about 11776.3038343956. The cubic root of 138681332 is about 517.6139847093.

The spelling of 138681332 in words is "one hundred thirty-eight million, six hundred eighty-one thousand, three hundred thirty-two".