138066752 has 14 divisors (see below), whose sum is σ = 273976338. Its totient is φ = 69033344.

The previous prime is 138066743. The next prime is 138066757. The reversal of 138066752 is 257660831.

It can be written as a sum of positive squares in only one way, i.e., 117852736 + 20214016 = 10856^2 + 4496^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138066757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078583 + ... + 1078710.

Almost surely, 2^138066752 is an apocalyptic number.

It is an amenable number.

138066752 is a deficient number, since it is larger than the sum of its proper divisors (135909586).

138066752 is an equidigital number, since it uses as much as digits as its factorization.

138066752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157305 (or 2157295 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 138066752 is about 11750.1809347771. The cubic root of 138066752 is about 516.8482332844.

The spelling of 138066752 in words is "one hundred thirty-eight million, sixty-six thousand, seven hundred fifty-two".