138556749 has 32 divisors (see below), whose sum is σ = 203164416. Its totient is φ = 83635200.

The previous prime is 138556709. The next prime is 138556801. The reversal of 138556749 is 947655831.

It is not a de Polignac number, because 138556749 - 2⁹ = 138556237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138556698 and 138556707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138556709) 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 31 ways as a sum of consecutive naturals, for example, 190224 + ... + 190950.

It is an arithmetic number, because the mean of its divisors is an integer number (6348888).

Almost surely, 2^138556749 is an apocalyptic number.

It is an amenable number.

138556749 is a deficient number, since it is larger than the sum of its proper divisors (64607667).

138556749 is a wasteful number, since it uses less digits than its factorization.

138556749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885.

The product of its digits is 907200, while the sum is 48.

The square root of 138556749 is about 11771.0130829933. The cubic root of 138556749 is about 517.4589404750.

The spelling of 138556749 in words is "one hundred thirty-eight million, five hundred fifty-six thousand, seven hundred forty-nine".