138205564 has 24 divisors (see below), whose sum is σ = 285329408. Its totient is φ = 57319920.

The previous prime is 138205559. The next prime is 138205577. The reversal of 138205564 is 465502831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78744 + ... + 80479.

Almost surely, 2^138205564 is an apocalyptic number.

138205564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138205564 is an abundant number, since it is smaller than the sum of its proper divisors (147123844).

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

138205564 is a wasteful number, since it uses less digits than its factorization.

138205564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159265 (or 159263 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 138205564 is about 11756.0862535114. The cubic root of 138205564 is about 517.0213879490.

The spelling of 138205564 in words is "one hundred thirty-eight million, two hundred five thousand, five hundred sixty-four".