138787550 has 24 divisors (see below), whose sum is σ = 281613672. Its totient is φ = 50468000.

The previous prime is 138787547. The next prime is 138787567. The reversal of 138787550 is 55787831.

It is a super-3 number, since 3×138787550³ (a number of 25 digits) contains 333 as substring.

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 11 ways as a sum of consecutive naturals, for example, 125621 + ... + 126720.

It is an arithmetic number, because the mean of its divisors is an integer number (11733903).

Almost surely, 2^138787550 is an apocalyptic number.

138787550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138787550 is an abundant number, since it is smaller than the sum of its proper divisors (142826122).

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

138787550 is a wasteful number, since it uses less digits than its factorization.

138787550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252364 (or 252359 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 44.

The square root of 138787550 is about 11780.8127902959. The cubic root of 138787550 is about 517.7461002838.

The spelling of 138787550 in words is "one hundred thirty-eight million, seven hundred eighty-seven thousand, five hundred fifty".