138377550 has 24 divisors (see below), whose sum is σ = 343176696. Its totient is φ = 36900640.

The previous prime is 138377543. The next prime is 138377557. The reversal of 138377550 is 55773831.

138377550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138377543) and next prime (138377557).

It is a junction number, because it is equal to n+sod(n) for n = 138377499 and 138377508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138377557) 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, 461109 + ... + 461408.

It is an arithmetic number, because the mean of its divisors is an integer number (14299029).

Almost surely, 2^138377550 is an apocalyptic number.

138377550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138377550 is an abundant number, since it is smaller than the sum of its proper divisors (204799146).

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

138377550 is a wasteful number, since it uses less digits than its factorization.

138377550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922532 (or 922527 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 138377550 is about 11763.3987435605. The cubic root of 138377550 is about 517.2357632570.

The spelling of 138377550 in words is "one hundred thirty-eight million, three hundred seventy-seven thousand, five hundred fifty".