138782550 has 24 divisors (see below), whose sum is σ = 344181096. Its totient is φ = 37008640.

The previous prime is 138782537. The next prime is 138782551. The reversal of 138782550 is 55287831.

It is a junction number, because it is equal to n+sod(n) for n = 138782499 and 138782508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138782551) 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 11 ways as a sum of consecutive naturals, for example, 462459 + ... + 462758.

It is an arithmetic number, because the mean of its divisors is an integer number (14340879).

Almost surely, 2^138782550 is an apocalyptic number.

138782550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138782550 is an abundant number, since it is smaller than the sum of its proper divisors (205398546).

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

138782550 is a wasteful number, since it uses less digits than its factorization.

138782550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925232 (or 925227 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 138782550 is about 11780.6005789179. The cubic root of 138782550 is about 517.7398827194.

The spelling of 138782550 in words is "one hundred thirty-eight million, seven hundred eighty-two thousand, five hundred fifty".