138851449 has 32 divisors (see below), whose sum is σ = 170496000. Its totient is φ = 111585600.

The previous prime is 138851431. The next prime is 138851459. The reversal of 138851449 is 944158831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138851449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138851459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187522 + ... + 188260.

It is an arithmetic number, because the mean of its divisors is an integer number (5328000).

Almost surely, 2^138851449 is an apocalyptic number.

138851449 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

138851449 is a deficient number, since it is larger than the sum of its proper divisors (31644551).

138851449 is a wasteful number, since it uses less digits than its factorization.

138851449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829.

The product of its digits is 138240, while the sum is 43.

The square root of 138851449 is about 11783.5244727543. The cubic root of 138851449 is about 517.8255463678.

The spelling of 138851449 in words is "one hundred thirty-eight million, eight hundred fifty-one thousand, four hundred forty-nine".