138278500 has 24 divisors (see below), whose sum is σ = 302001336. Its totient is φ = 55311200.

The previous prime is 138278479. The next prime is 138278501. The reversal of 138278500 is 5872831.

It can be written as a sum of positive squares in 4 ways, for example, as 2742336 + 135536164 = 1656^2 + 11642^2 .

It is not an unprimeable number, because it can be changed into a prime (138278501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137779 + ... + 138778.

It is an arithmetic number, because the mean of its divisors is an integer number (12583389).

Almost surely, 2^138278500 is an apocalyptic number.

138278500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138278500 is an abundant number, since it is smaller than the sum of its proper divisors (163722836).

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

138278500 is a wasteful number, since it uses less digits than its factorization.

138278500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276576 (or 276564 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 138278500 is about 11759.1878971296. The cubic root of 138278500 is about 517.1123221566.

The spelling of 138278500 in words is "one hundred thirty-eight million, two hundred seventy-eight thousand, five hundred".