138900943 has 2 divisors, whose sum is σ = 138900944. Its totient is φ = 138900942.

The previous prime is 138900941. The next prime is 138900947. The reversal of 138900943 is 349009831.

It is a weak prime.

It is an emirp because it is prime and its reverse (349009831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138900943 - 2¹ = 138900941 is a prime.

Together with 138900941, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138900941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69450471 + 69450472.

It is an arithmetic number, because the mean of its divisors is an integer number (69450472).

Almost surely, 2^138900943 is an apocalyptic number.

138900943 is a deficient number, since it is larger than the sum of its proper divisors (1).

138900943 is an equidigital number, since it uses as much as digits as its factorization.

138900943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 138900943 is about 11785.6244213024. The cubic root of 138900943 is about 517.8870658626.

The spelling of 138900943 in words is "one hundred thirty-eight million, nine hundred thousand, nine hundred forty-three".