138651706 has 8 divisors (see below), whose sum is σ = 209885940. Its totient is φ = 68689728.

The previous prime is 138651661. The next prime is 138651707. The reversal of 138651706 is 607156831.

It can be written as a sum of positive squares in 2 ways, for example, as 114297481 + 24354225 = 10691^2 + 4935^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (138651707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317791 + ... + 318226.

Almost surely, 2^138651706 is an apocalyptic number.

138651706 is a deficient number, since it is larger than the sum of its proper divisors (71234234).

138651706 is a wasteful number, since it uses less digits than its factorization.

138651706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636128.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 138651706 is about 11775.0459022460. The cubic root of 138651706 is about 517.5771234057.

The spelling of 138651706 in words is "one hundred thirty-eight million, six hundred fifty-one thousand, seven hundred six".