138861147 has 8 divisors (see below), whose sum is σ = 189454144. Its totient is φ = 90421128.

The previous prime is 138861131. The next prime is 138861157. The reversal of 138861147 is 741168831.

138861147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 138861147 - 2⁴ = 138861131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138861127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538093 + ... + 538350.

It is an arithmetic number, because the mean of its divisors is an integer number (23681768).

Almost surely, 2^138861147 is an apocalyptic number.

138861147 is a deficient number, since it is larger than the sum of its proper divisors (50592997).

138861147 is a wasteful number, since it uses less digits than its factorization.

138861147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076489.

The product of its digits is 32256, while the sum is 39.

The square root of 138861147 is about 11783.9359723311. The cubic root of 138861147 is about 517.8376018301.

The spelling of 138861147 in words is "one hundred thirty-eight million, eight hundred sixty-one thousand, one hundred forty-seven".