138228750 has 120 divisors (see below), whose sum is σ = 408637944. Its totient is φ = 33480000.

The previous prime is 138228737. The next prime is 138228773. The reversal of 138228750 is 57822831.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 123192 + ... + 124308.

Almost surely, 2^138228750 is an apocalyptic number.

138228750 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 138228750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204318972).

138228750 is an abundant number, since it is smaller than the sum of its proper divisors (270409194).

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

138228750 is a wasteful number, since it uses less digits than its factorization.

138228750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 1138 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 138228750 is about 11757.0723396601. The cubic root of 138228750 is about 517.0502989596.

The spelling of 138228750 in words is "one hundred thirty-eight million, two hundred twenty-eight thousand, seven hundred fifty".