138656038 has 4 divisors (see below), whose sum is σ = 207984060. Its totient is φ = 69328018.

The previous prime is 138656027. The next prime is 138656041. The reversal of 138656038 is 830656831.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 34664008 + ... + 34664011.

It is an arithmetic number, because the mean of its divisors is an integer number (51996015).

Almost surely, 2^138656038 is an apocalyptic number.

138656038 is a deficient number, since it is larger than the sum of its proper divisors (69328022).

138656038 is an equidigital number, since it uses as much as digits as its factorization.

138656038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69328021.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 138656038 is about 11775.2298491367. The cubic root of 138656038 is about 517.5825137006.

The spelling of 138656038 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, thirty-eight".