138930923 has 2 divisors, whose sum is σ = 138930924. Its totient is φ = 138930922.

The previous prime is 138930887. The next prime is 138930929. The reversal of 138930923 is 329039831.

It is a strong prime.

It is an emirp because it is prime and its reverse (329039831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138930923 - 2¹⁶ = 138865387 is a prime.

It is not a weakly prime, because it can be changed into another prime (138930929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69465461 + 69465462.

It is an arithmetic number, because the mean of its divisors is an integer number (69465462).

Almost surely, 2^138930923 is an apocalyptic number.

138930923 is a deficient number, since it is larger than the sum of its proper divisors (1).

138930923 is an equidigital number, since it uses as much as digits as its factorization.

138930923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 138930923 is about 11786.8962411654. The cubic root of 138930923 is about 517.9243229586.

The spelling of 138930923 in words is "one hundred thirty-eight million, nine hundred thirty thousand, nine hundred twenty-three".