138831284 has 12 divisors (see below), whose sum is σ = 243082308. Its totient is φ = 69379200.

The previous prime is 138831283. The next prime is 138831293. The reversal of 138831284 is 482138831.

It can be written as a sum of positive squares in 2 ways, for example, as 32741284 + 106090000 = 5722^2 + 10300^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138831283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614 + ... + 16674.

It is an arithmetic number, because the mean of its divisors is an integer number (20256859).

Almost surely, 2^138831284 is an apocalyptic number.

It is an amenable number.

138831284 is a deficient number, since it is larger than the sum of its proper divisors (104251024).

138831284 is a wasteful number, since it uses less digits than its factorization.

138831284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18226 (or 18224 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 138831284 is about 11782.6687978573. The cubic root of 138831284 is about 517.8004777117.

The spelling of 138831284 in words is "one hundred thirty-eight million, eight hundred thirty-one thousand, two hundred eighty-four".