138686347 has 2 divisors, whose sum is σ = 138686348. Its totient is φ = 138686346.

The previous prime is 138686321. The next prime is 138686371. The reversal of 138686347 is 743686831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138686347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138686297 and 138686306.

It is not a weakly prime, because it can be changed into another prime (138686747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69343173 + 69343174.

It is an arithmetic number, because the mean of its divisors is an integer number (69343174).

Almost surely, 2^138686347 is an apocalyptic number.

138686347 is a deficient number, since it is larger than the sum of its proper divisors (1).

138686347 is an equidigital number, since it uses as much as digits as its factorization.

138686347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 138686347 is about 11776.5167600611. The cubic root of 138686347 is about 517.6202239601.

The spelling of 138686347 in words is "one hundred thirty-eight million, six hundred eighty-six thousand, three hundred forty-seven".