138942449 has 2 divisors, whose sum is σ = 138942450. Its totient is φ = 138942448.

The previous prime is 138942443. The next prime is 138942467. The reversal of 138942449 is 944249831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109348849 + 29593600 = 10457^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 138942449 - 2¹² = 138938353 is a prime.

It is not a weakly prime, because it can be changed into another prime (138942443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69471224 + 69471225.

It is an arithmetic number, because the mean of its divisors is an integer number (69471225).

Almost surely, 2^138942449 is an apocalyptic number.

It is an amenable number.

138942449 is a deficient number, since it is larger than the sum of its proper divisors (1).

138942449 is an equidigital number, since it uses as much as digits as its factorization.

138942449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 138942449 is about 11787.3851638097. The cubic root of 138942449 is about 517.9386452577.

The spelling of 138942449 in words is "one hundred thirty-eight million, nine hundred forty-two thousand, four hundred forty-nine".