138947 has 8 divisors (see below), whose sum is σ = 149760. Its totient is φ = 128520.

The previous prime is 138937. The next prime is 138959. The reversal of 138947 is 749831.

138947 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 a cyclic number.

It is not a de Polignac number, because 138947 - 2⁶ = 138883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138917) 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, 1298 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (18720).

2¹³⁸⁹⁴⁷ is an apocalyptic number.

138947 is a deficient number, since it is larger than the sum of its proper divisors (10813).

138947 is a wasteful number, since it uses less digits than its factorization.

138947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193.

The product of its digits is 6048, while the sum is 32.

The square root of 138947 is about 372.7559523334. The cubic root of 138947 is about 51.7944300148.

The spelling of 138947 in words is "one hundred thirty-eight thousand, nine hundred forty-seven".