138481448 has 64 divisors (see below), whose sum is σ = 306240000. Its totient is φ = 58677696.

The previous prime is 138481423. The next prime is 138481451. The reversal of 138481448 is 844184831.

It is a super-2 number, since 2×138481448² = 38354222880353408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298865 + ... + 299327.

It is an arithmetic number, because the mean of its divisors is an integer number (4785000).

Almost surely, 2^138481448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138481448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153120000).

138481448 is an abundant number, since it is smaller than the sum of its proper divisors (167758552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138481448 is a wasteful number, since it uses less digits than its factorization.

138481448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599 (or 581 counting only the distinct ones).

The product of its digits is 98304, while the sum is 41.

The square root of 138481448 is about 11767.8140705910. The cubic root of 138481448 is about 517.3651828947.

The spelling of 138481448 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, four hundred forty-eight".