138764357 has 2 divisors, whose sum is σ = 138764358. Its totient is φ = 138764356.

The previous prime is 138764309. The next prime is 138764371. The reversal of 138764357 is 753467831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108139201 + 30625156 = 10399^2 + 5534^2 .

It is a cyclic number.

It is not a de Polignac number, because 138764357 - 2²² = 134570053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138764057) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69382178 + 69382179.

It is an arithmetic number, because the mean of its divisors is an integer number (69382179).

Almost surely, 2^138764357 is an apocalyptic number.

It is an amenable number.

138764357 is a deficient number, since it is larger than the sum of its proper divisors (1).

138764357 is an equidigital number, since it uses as much as digits as its factorization.

138764357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 44.

The square root of 138764357 is about 11779.8283943358. The cubic root of 138764357 is about 517.7172582293.

The spelling of 138764357 in words is "one hundred thirty-eight million, seven hundred sixty-four thousand, three hundred fifty-seven".