138897248 has 48 divisors (see below), whose sum is σ = 313528320. Its totient is φ = 59335296.

The previous prime is 138897197. The next prime is 138897257. The reversal of 138897248 is 842798831.

It is a junction number, because it is equal to n+sod(n) for n = 138897196 and 138897205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84983 + ... + 86601.

It is an arithmetic number, because the mean of its divisors is an integer number (6531840).

Almost surely, 2^138897248 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 138897248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156764160).

138897248 is an abundant number, since it is smaller than the sum of its proper divisors (174631072).

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

138897248 is a wasteful number, since it uses less digits than its factorization.

138897248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019 (or 2011 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The square root of 138897248 is about 11785.4676614889. The cubic root of 138897248 is about 517.8824735979.

The spelling of 138897248 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, two hundred forty-eight".