138281912 has 8 divisors (see below), whose sum is σ = 259278600. Its totient is φ = 69140952.

The previous prime is 138281873. The next prime is 138281921. The reversal of 138281912 is 219182831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×138281912³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8642612 + ... + 8642627.

It is an arithmetic number, because the mean of its divisors is an integer number (32409825).

Almost surely, 2^138281912 is an apocalyptic number.

It is an amenable number.

138281912 is a deficient number, since it is larger than the sum of its proper divisors (120996688).

138281912 is a wasteful number, since it uses less digits than its factorization.

138281912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17285245 (or 17285241 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 138281912 is about 11759.3329742805. The cubic root of 138281912 is about 517.1165753431.

It can be divided in two parts, 1382819 and 12, that added together give a palindrome (1382831).

The spelling of 138281912 in words is "one hundred thirty-eight million, two hundred eighty-one thousand, nine hundred twelve".