138254939 has 2 divisors, whose sum is σ = 138254940. Its totient is φ = 138254938.

The previous prime is 138254929. The next prime is 138254981. The reversal of 138254939 is 939452831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138254939 - 2⁴ = 138254923 is a prime.

It is a super-2 number, since 2×138254939² = 38228856315787442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138254939.

It is not a weakly prime, because it can be changed into another prime (138254929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69127469 + 69127470.

It is an arithmetic number, because the mean of its divisors is an integer number (69127470).

Almost surely, 2^138254939 is an apocalyptic number.

138254939 is a deficient number, since it is larger than the sum of its proper divisors (1).

138254939 is an equidigital number, since it uses as much as digits as its factorization.

138254939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The square root of 138254939 is about 11758.1860420730. The cubic root of 138254939 is about 517.0829505732.

The spelling of 138254939 in words is "one hundred thirty-eight million, two hundred fifty-four thousand, nine hundred thirty-nine".