138532449 has 16 divisors (see below), whose sum is σ = 208451520. Its totient is φ = 81063360.

The previous prime is 138532447. The next prime is 138532469. The reversal of 138532449 is 944235831.

It is not a de Polignac number, because 138532449 - 2¹ = 138532447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138532447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71422 + ... + 73335.

It is an arithmetic number, because the mean of its divisors is an integer number (13028220).

Almost surely, 2^138532449 is an apocalyptic number.

It is an amenable number.

138532449 is a deficient number, since it is larger than the sum of its proper divisors (69919071).

138532449 is a wasteful number, since it uses less digits than its factorization.

138532449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144800.

The product of its digits is 103680, while the sum is 39.

The square root of 138532449 is about 11769.9808411059. The cubic root of 138532449 is about 517.4286881596.

The spelling of 138532449 in words is "one hundred thirty-eight million, five hundred thirty-two thousand, four hundred forty-nine".