138280212 has 108 divisors (see below), whose sum is σ = 413501088. Its totient is φ = 38167200.

The previous prime is 138280187. The next prime is 138280223. The reversal of 138280212 is 212082831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 241887 + ... + 242457.

Almost surely, 2^138280212 is an apocalyptic number.

138280212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138280212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206750544).

138280212 is an abundant number, since it is smaller than the sum of its proper divisors (275220876).

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

138280212 is a wasteful number, since it uses less digits than its factorization.

138280212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 138280212 is about 11759.2606910469. The cubic root of 138280212 is about 517.1144562378.

The spelling of 138280212 in words is "one hundred thirty-eight million, two hundred eighty thousand, two hundred twelve".