138332479 has 2 divisors, whose sum is σ = 138332480. Its totient is φ = 138332478.

The previous prime is 138332437. The next prime is 138332497. The reversal of 138332479 is 974233831.

Together with next prime (138332497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138332479 - 2⁹ = 138331967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138338479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69166239 + 69166240.

It is an arithmetic number, because the mean of its divisors is an integer number (69166240).

Almost surely, 2^138332479 is an apocalyptic number.

138332479 is a deficient number, since it is larger than the sum of its proper divisors (1).

138332479 is an equidigital number, since it uses as much as digits as its factorization.

138332479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 138332479 is about 11761.4828571911. The cubic root of 138332479 is about 517.1796008122.

The spelling of 138332479 in words is "one hundred thirty-eight million, three hundred thirty-two thousand, four hundred seventy-nine".