138839093 has 2 divisors, whose sum is σ = 138839094. Its totient is φ = 138839092.

The previous prime is 138839087. The next prime is 138839101. The reversal of 138839093 is 390938831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138839089 + 4 = 11783^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 138839093 - 2¹⁰ = 138838069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138838093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69419546 + 69419547.

It is an arithmetic number, because the mean of its divisors is an integer number (69419547).

Almost surely, 2^138839093 is an apocalyptic number.

It is an amenable number.

138839093 is a deficient number, since it is larger than the sum of its proper divisors (1).

138839093 is an equidigital number, since it uses as much as digits as its factorization.

138839093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 138839093 is about 11783.0001697361. Note that the first 3 decimals coincide. The cubic root of 138839093 is about 517.8101859657.

The spelling of 138839093 in words is "one hundred thirty-eight million, eight hundred thirty-nine thousand, ninety-three".