138628449 has 16 divisors (see below), whose sum is σ = 205813440. Its totient is φ = 92221920.

The previous prime is 138628411. The next prime is 138628471. The reversal of 138628449 is 944826831.

It is a happy number.

138628449 is a `hidden beast` number, since 13 + 8 + 628 + 4 + 4 + 9 = 666.

It is not a de Polignac number, because 138628449 - 2¹¹ = 138626401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138628409) 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, 8029 + ... + 18485.

It is an arithmetic number, because the mean of its divisors is an integer number (12863340).

Almost surely, 2^138628449 is an apocalyptic number.

It is an amenable number.

138628449 is a deficient number, since it is larger than the sum of its proper divisors (67184991).

138628449 is a wasteful number, since it uses less digits than its factorization.

138628449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10957 (or 10951 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 138628449 is about 11774.0583062935. The cubic root of 138628449 is about 517.5481828693.

The spelling of 138628449 in words is "one hundred thirty-eight million, six hundred twenty-eight thousand, four hundred forty-nine".