138550 has 24 divisors (see below), whose sum is σ = 274536. Its totient is φ = 51840.

The previous prime is 138547. The next prime is 138559. The reversal of 138550 is 55831.

138550 = 25² + 26² + ... + 75².

138550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138550² = 38392205000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 769 + ... + 931.

It is an arithmetic number, because the mean of its divisors is an integer number (11439).

2¹³⁸⁵⁵⁰ is an apocalyptic number.

138550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138550 is a deficient number, since it is larger than the sum of its proper divisors (135986).

138550 is a wasteful number, since it uses less digits than its factorization.

138550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 138550 is about 372.2230514087. The cubic root of 138550 is about 51.7450538654.

The spelling of 138550 in words is "one hundred thirty-eight thousand, five hundred fifty".