138255947 has 2 divisors, whose sum is σ = 138255948. Its totient is φ = 138255946.

The previous prime is 138255937. The next prime is 138255961. The reversal of 138255947 is 749552831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138255947 - 2¹⁰ = 138254923 is a prime.

It is a super-2 number, since 2×138255947² = 38229413761733618, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138255898 and 138255907.

It is not a weakly prime, because it can be changed into another prime (138255937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69127973 + 69127974.

It is an arithmetic number, because the mean of its divisors is an integer number (69127974).

Almost surely, 2^138255947 is an apocalyptic number.

138255947 is a deficient number, since it is larger than the sum of its proper divisors (1).

138255947 is an equidigital number, since it uses as much as digits as its factorization.

138255947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 44.

The square root of 138255947 is about 11758.2289057494. The cubic root of 138255947 is about 517.0842072332.

The spelling of 138255947 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, nine hundred forty-seven".