138252706 has 4 divisors (see below), whose sum is σ = 207379062. Its totient is φ = 69126352.

The previous prime is 138252679. The next prime is 138252707. The reversal of 138252706 is 607252831.

It is a happy number.

138252706 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in only one way, i.e., 136539225 + 1713481 = 11685^2 + 1309^2 .

It is a super-2 number, since 2×138252706² = 38227621432644872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138252707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34563175 + ... + 34563178.

Almost surely, 2^138252706 is an apocalyptic number.

138252706 is a deficient number, since it is larger than the sum of its proper divisors (69126356).

138252706 is an equidigital number, since it uses as much as digits as its factorization.

138252706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69126355.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 138252706 is about 11758.0910865667. The cubic root of 138252706 is about 517.0801667006.

The spelling of 138252706 in words is "one hundred thirty-eight million, two hundred fifty-two thousand, seven hundred six".