138989312 has 108 divisors (see below), whose sum is σ = 349057968. Its totient is φ = 54067200.

The previous prime is 138989281. The next prime is 138989317. The reversal of 138989312 is 213989831.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138989317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216512 + ... + 217152.

Almost surely, 2^138989312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138989312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174528984).

138989312 is an abundant number, since it is smaller than the sum of its proper divisors (210068656).

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

138989312 is an equidigital number, since it uses as much as digits as its factorization.

138989312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 661 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The square root of 138989312 is about 11789.3728416740. The cubic root of 138989312 is about 517.9968694374.

The spelling of 138989312 in words is "one hundred thirty-eight million, nine hundred eighty-nine thousand, three hundred twelve".