138458629 has 2 divisors, whose sum is σ = 138458630. Its totient is φ = 138458628.

The previous prime is 138458627. The next prime is 138458633. The reversal of 138458629 is 926854831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79245604 + 59213025 = 8902^2 + 7695^2 .

It is a cyclic number.

It is not a de Polignac number, because 138458629 - 2¹ = 138458627 is a prime.

Together with 138458627, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138458627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69229314 + 69229315.

It is an arithmetic number, because the mean of its divisors is an integer number (69229315).

Almost surely, 2^138458629 is an apocalyptic number.

It is an amenable number.

138458629 is a deficient number, since it is larger than the sum of its proper divisors (1).

138458629 is an equidigital number, since it uses as much as digits as its factorization.

138458629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 138458629 is about 11766.8444792986. The cubic root of 138458629 is about 517.3367641551.

The spelling of 138458629 in words is "one hundred thirty-eight million, four hundred fifty-eight thousand, six hundred twenty-nine".