138888750 has 320 divisors, whose sum is σ = 478646784. Its totient is φ = 25920000.

The previous prime is 138888707. The next prime is 138888767. The reversal of 138888750 is 57888831.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 138888750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3753732 + ... + 3753768.

Almost surely, 2^138888750 is an apocalyptic number.

138888750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138888750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239323392).

138888750 is an abundant number, since it is smaller than the sum of its proper divisors (339758034).

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

138888750 is a wasteful number, since it uses less digits than its factorization.

138888750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 48.

The square root of 138888750 is about 11785.1071272178. The cubic root of 138888750 is about 517.8719117016.

It can be divided in two parts, 138 and 888750, that added together give a palindrome (888888).

The spelling of 138888750 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, seven hundred fifty".