138224785 has 8 divisors (see below), whose sum is σ = 170352936. Its totient is φ = 107591040.

The previous prime is 138224771. The next prime is 138224789. The reversal of 138224785 is 587422831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5721664 + 132503121 = 2392^2 + 11511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138224785 - 2⁷ = 138224657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138224789) 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 7 ways as a sum of consecutive naturals, for example, 373396 + ... + 373765.

It is an arithmetic number, because the mean of its divisors is an integer number (21294117).

Almost surely, 2^138224785 is an apocalyptic number.

It is an amenable number.

138224785 is a deficient number, since it is larger than the sum of its proper divisors (32128151).

138224785 is an equidigital number, since it uses as much as digits as its factorization.

138224785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747203.

The product of its digits is 107520, while the sum is 40.

The square root of 138224785 is about 11756.9037165403. The cubic root of 138224785 is about 517.0453551641.

The spelling of 138224785 in words is "one hundred thirty-eight million, two hundred twenty-four thousand, seven hundred eighty-five".