138881550 has 48 divisors (see below), whose sum is σ = 355548672. Its totient is φ = 35839200.

The previous prime is 138881531. The next prime is 138881557. The reversal of 138881550 is 55188831.

It is a junction number, because it is equal to n+sod(n) for n = 138881499 and 138881508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138881557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10284 + ... + 19583.

It is an arithmetic number, because the mean of its divisors is an integer number (7407264).

Almost surely, 2^138881550 is an apocalyptic number.

138881550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138881550 is an abundant number, since it is smaller than the sum of its proper divisors (216667122).

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

138881550 is a wasteful number, since it uses less digits than its factorization.

138881550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29913 (or 29908 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 138881550 is about 11784.8016529766. The cubic root of 138881550 is about 517.8629627113.

The spelling of 138881550 in words is "one hundred thirty-eight million, eight hundred eighty-one thousand, five hundred fifty".