138308148 has 120 divisors (see below), whose sum is σ = 398591424. Its totient is φ = 41472000.

The previous prime is 138308147. The next prime is 138308153. The reversal of 138308148 is 841803831.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138308147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 538036 + ... + 538292.

Almost surely, 2^138308148 is an apocalyptic number.

138308148 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138308148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199295712).

138308148 is an abundant number, since it is smaller than the sum of its proper divisors (260283276).

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

138308148 is a wasteful number, since it uses less digits than its factorization.

138308148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 138308148 is about 11760.4484608369. The cubic root of 138308148 is about 517.1492771678.

The spelling of 138308148 in words is "one hundred thirty-eight million, three hundred eight thousand, one hundred forty-eight".