138448384 has 20 divisors (see below), whose sum is σ = 276627384. Its totient is φ = 69223936.

The previous prime is 138448381. The next prime is 138448403. The reversal of 138448384 is 483844831.

It is a super-2 number, since 2×138448384² = 38335910064422912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138448384.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138448381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134692 + ... + 135715.

Almost surely, 2^138448384 is an apocalyptic number.

It is an amenable number.

138448384 is a deficient number, since it is larger than the sum of its proper divisors (138179000).

138448384 is an frugal number, since it uses more digits than its factorization.

138448384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270425 (or 270409 counting only the distinct ones).

The product of its digits is 294912, while the sum is 43.

The square root of 138448384 is about 11766.4091378806. The cubic root of 138448384 is about 517.3240040358.

The spelling of 138448384 in words is "one hundred thirty-eight million, four hundred forty-eight thousand, three hundred eighty-four".