138425550 has 48 divisors (see below), whose sum is σ = 346732272. Its totient is φ = 36544000.

The previous prime is 138425549. The next prime is 138425629. The reversal of 138425550 is 55524831.

138425550 = T₃₁ + T₃₂ + ... + T₉₃₉.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10582 + ... + 19718.

It is an arithmetic number, because the mean of its divisors is an integer number (7223589).

Almost surely, 2^138425550 is an apocalyptic number.

138425550 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 138425550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173366136).

138425550 is an abundant number, since it is smaller than the sum of its proper divisors (208306722).

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

138425550 is a wasteful number, since it uses less digits than its factorization.

138425550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9253 (or 9248 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 138425550 is about 11765.4387933472. The cubic root of 138425550 is about 517.2955620864.

The spelling of 138425550 in words is "one hundred thirty-eight million, four hundred twenty-five thousand, five hundred fifty".