138260399 has 2 divisors, whose sum is σ = 138260400. Its totient is φ = 138260398.

The previous prime is 138260387. The next prime is 138260401. The reversal of 138260399 is 993062831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138260399 - 2¹² = 138256303 is a prime.

Together with 138260401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138266399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69130199 + 69130200.

It is an arithmetic number, because the mean of its divisors is an integer number (69130200).

Almost surely, 2^138260399 is an apocalyptic number.

138260399 is a deficient number, since it is larger than the sum of its proper divisors (1).

138260399 is an equidigital number, since it uses as much as digits as its factorization.

138260399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 138260399 is about 11758.4182184510. The cubic root of 138260399 is about 517.0897574084.

The spelling of 138260399 in words is "one hundred thirty-eight million, two hundred sixty thousand, three hundred ninety-nine".