138055554 has 96 divisors (see below), whose sum is σ = 372677760. Its totient is φ = 35963136.

The previous prime is 138055553. The next prime is 138055571. The reversal of 138055554 is 455550831.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138055553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 145309 + ... + 146255.

It is an arithmetic number, because the mean of its divisors is an integer number (3882060).

Almost surely, 2^138055554 is an apocalyptic number.

138055554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138055554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186338880).

138055554 is an abundant number, since it is smaller than the sum of its proper divisors (234622206).

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

138055554 is a wasteful number, since it uses less digits than its factorization.

138055554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1061 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The square root of 138055554 is about 11749.7044218142. The cubic root of 138055554 is about 516.8342597948.

The spelling of 138055554 in words is "one hundred thirty-eight million, fifty-five thousand, five hundred fifty-four".