138944797 has 2 divisors, whose sum is σ = 138944798. Its totient is φ = 138944796.

The previous prime is 138944789. The next prime is 138944849. The reversal of 138944797 is 797449831.

It is an a-pointer prime, because the next prime (138944849) can be obtained adding 138944797 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77070841 + 61873956 = 8779^2 + 7866^2 .

It is a cyclic number.

It is not a de Polignac number, because 138944797 - 2³ = 138944789 is a prime.

It is a super-2 number, since 2×138944797² = 38611313226742418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138944717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69472398 + 69472399.

It is an arithmetic number, because the mean of its divisors is an integer number (69472399).

Almost surely, 2^138944797 is an apocalyptic number.

It is an amenable number.

138944797 is a deficient number, since it is larger than the sum of its proper divisors (1).

138944797 is an equidigital number, since it uses as much as digits as its factorization.

138944797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 52.

The square root of 138944797 is about 11787.4847613899. The cubic root of 138944797 is about 517.9415628040.

The spelling of 138944797 in words is "one hundred thirty-eight million, nine hundred forty-four thousand, seven hundred ninety-seven".