138444825 has 12 divisors (see below), whose sum is σ = 228895568. Its totient is φ = 73837200.

The previous prime is 138444799. The next prime is 138444829. The reversal of 138444825 is 528444831.

It is not a de Polignac number, because 138444825 - 2⁵ = 138444793 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138444829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 922891 + ... + 923040.

Almost surely, 2^138444825 is an apocalyptic number.

138444825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138444825 is a deficient number, since it is larger than the sum of its proper divisors (90450743).

138444825 is a wasteful number, since it uses less digits than its factorization.

138444825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845944 (or 1845939 counting only the distinct ones).

The product of its digits is 122880, while the sum is 39.

The square root of 138444825 is about 11766.2579013041. The cubic root of 138444825 is about 517.3195711637.

The spelling of 138444825 in words is "one hundred thirty-eight million, four hundred forty-four thousand, eight hundred twenty-five".