138804157 has 2 divisors, whose sum is σ = 138804158. Its totient is φ = 138804156.

The previous prime is 138804151. The next prime is 138804161. The reversal of 138804157 is 751408831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103449241 + 35354916 = 10171^2 + 5946^2 .

It is a cyclic number.

It is not a de Polignac number, because 138804157 - 2¹¹ = 138802109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138804151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69402078 + 69402079.

It is an arithmetic number, because the mean of its divisors is an integer number (69402079).

Almost surely, 2^138804157 is an apocalyptic number.

It is an amenable number.

138804157 is a deficient number, since it is larger than the sum of its proper divisors (1).

138804157 is an equidigital number, since it uses as much as digits as its factorization.

138804157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 138804157 is about 11781.5176017354. The cubic root of 138804157 is about 517.7667502306.

The spelling of 138804157 in words is "one hundred thirty-eight million, eight hundred four thousand, one hundred fifty-seven".