138032879 has 2 divisors, whose sum is σ = 138032880. Its totient is φ = 138032878.

The previous prime is 138032861. The next prime is 138032893. The reversal of 138032879 is 978230831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138032879 - 2¹² = 138028783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138032819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69016439 + 69016440.

It is an arithmetic number, because the mean of its divisors is an integer number (69016440).

Almost surely, 2^138032879 is an apocalyptic number.

138032879 is a deficient number, since it is larger than the sum of its proper divisors (1).

138032879 is an equidigital number, since it uses as much as digits as its factorization.

138032879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 138032879 is about 11748.7394643000. The cubic root of 138032879 is about 516.8059623494.

The spelling of 138032879 in words is "one hundred thirty-eight million, thirty-two thousand, eight hundred seventy-nine".