138968143 has 4 divisors (see below), whose sum is σ = 141924960. Its totient is φ = 136011328.

The previous prime is 138968119. The next prime is 138968153. The reversal of 138968143 is 341869831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341869831 = 19 ⋅17993149.

It is a cyclic number.

It is not a de Polignac number, because 138968143 - 2⁵ = 138968111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138968143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138968113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1478338 + ... + 1478431.

It is an arithmetic number, because the mean of its divisors is an integer number (35481240).

Almost surely, 2^138968143 is an apocalyptic number.

138968143 is a deficient number, since it is larger than the sum of its proper divisors (2956817).

138968143 is an equidigital number, since it uses as much as digits as its factorization.

138968143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956816.

The product of its digits is 124416, while the sum is 43.

The square root of 138968143 is about 11788.4750073960. The cubic root of 138968143 is about 517.9705699752.

The spelling of 138968143 in words is "one hundred thirty-eight million, nine hundred sixty-eight thousand, one hundred forty-three".