138406550 has 24 divisors (see below), whose sum is σ = 258378552. Its totient is φ = 55160000.

The previous prime is 138406549. The next prime is 138406577. The reversal of 138406550 is 55604831.

It is a happy number.

138406550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 9125 + ... + 18975.

It is an arithmetic number, because the mean of its divisors is an integer number (10765773).

Almost surely, 2^138406550 is an apocalyptic number.

138406550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138406550 is a deficient number, since it is larger than the sum of its proper divisors (119972002).

138406550 is a wasteful number, since it uses less digits than its factorization.

138406550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10144 (or 10139 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 138406550 is about 11764.6313159402. The cubic root of 138406550 is about 517.2718933697.

The spelling of 138406550 in words is "one hundred thirty-eight million, four hundred six thousand, five hundred fifty".