138347747 has 2 divisors, whose sum is σ = 138347748. Its totient is φ = 138347746.

The previous prime is 138347687. The next prime is 138347749. The reversal of 138347747 is 747743831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138347747 - 2¹⁰ = 138346723 is a prime.

Together with 138347749, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_7823987 and since 138347747 and 7823987 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 138347698 and 138347707.

It is not a weakly prime, because it can be changed into another prime (138347749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69173873 + 69173874.

It is an arithmetic number, because the mean of its divisors is an integer number (69173874).

Almost surely, 2^138347747 is an apocalyptic number.

138347747 is a deficient number, since it is larger than the sum of its proper divisors (1).

138347747 is an equidigital number, since it uses as much as digits as its factorization.

138347747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 44.

The square root of 138347747 is about 11762.1319070992. The cubic root of 138347747 is about 517.1986274541.

The spelling of 138347747 in words is "one hundred thirty-eight million, three hundred forty-seven thousand, seven hundred forty-seven".