138405850 has 36 divisors (see below), whose sum is σ = 282977982. Its totient is φ = 50327200.

The previous prime is 138405847. The next prime is 138405851. The reversal of 138405850 is 58504831.

138405850 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 125148969 + 13256881 = 11187^2 + 3641^2 .

It is not an unprimeable number, because it can be changed into a prime (138405851) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5389 + ... + 17488.

Almost surely, 2^138405850 is an apocalyptic number.

138405850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138405850 is an abundant number, since it is smaller than the sum of its proper divisors (144572132).

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

138405850 is a wasteful number, since it uses less digits than its factorization.

138405850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22911 (or 22895 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 138405850 is about 11764.6015657140. The cubic root of 138405850 is about 517.2710213230.

The spelling of 138405850 in words is "one hundred thirty-eight million, four hundred five thousand, eight hundred fifty".