138453888 has 64 divisors (see below), whose sum is σ = 380480400. Its totient is φ = 44556288.

The previous prime is 138453881. The next prime is 138453901. The reversal of 138453888 is 888354831.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138453881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4920 + ... + 17352.

Almost surely, 2^138453888 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 138453888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190240200).

138453888 is an abundant number, since it is smaller than the sum of its proper divisors (242026512).

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

138453888 is a wasteful number, since it uses less digits than its factorization.

138453888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12479 (or 12467 counting only the distinct ones).

The product of its digits is 737280, while the sum is 48.

The square root of 138453888 is about 11766.6430216948. The cubic root of 138453888 is about 517.3308593309.

The spelling of 138453888 in words is "one hundred thirty-eight million, four hundred fifty-three thousand, eight hundred eighty-eight".