138772847 has 2 divisors, whose sum is σ = 138772848. Its totient is φ = 138772846.

The previous prime is 138772817. The next prime is 138772871. The reversal of 138772847 is 748277831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138772847 - 2⁶ = 138772783 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138772807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69386423 + 69386424.

It is an arithmetic number, because the mean of its divisors is an integer number (69386424).

Almost surely, 2^138772847 is an apocalyptic number.

138772847 is a deficient number, since it is larger than the sum of its proper divisors (1).

138772847 is an equidigital number, since it uses as much as digits as its factorization.

138772847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 47.

The square root of 138772847 is about 11780.1887506101. The cubic root of 138772847 is about 517.7278164878.

The spelling of 138772847 in words is "one hundred thirty-eight million, seven hundred seventy-two thousand, eight hundred forty-seven".