138547957 has 2 divisors, whose sum is σ = 138547958. Its totient is φ = 138547956.

The previous prime is 138547951. The next prime is 138547973. The reversal of 138547957 is 759745831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125305636 + 13242321 = 11194^2 + 3639^2 .

It is a cyclic number.

It is not a de Polignac number, because 138547957 - 2³ = 138547949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138547957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138547951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69273978 + 69273979.

It is an arithmetic number, because the mean of its divisors is an integer number (69273979).

Almost surely, 2^138547957 is an apocalyptic number.

It is an amenable number.

138547957 is a deficient number, since it is larger than the sum of its proper divisors (1).

138547957 is an equidigital number, since it uses as much as digits as its factorization.

138547957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 49.

The square root of 138547957 is about 11770.6396172850. The cubic root of 138547957 is about 517.4479952720.

The spelling of 138547957 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, nine hundred fifty-seven".