138988106 has 8 divisors (see below), whose sum is σ = 208778340. Its totient is φ = 69395328.

The previous prime is 138988093. The next prime is 138988111. The reversal of 138988106 is 601889831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 138274081 + 714025 = 11759^2 + 845^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47591 + ... + 50426.

Almost surely, 2^138988106 is an apocalyptic number.

138988106 is a deficient number, since it is larger than the sum of its proper divisors (69790234).

138988106 is an equidigital number, since it uses as much as digits as its factorization.

138988106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98728.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 138988106 is about 11789.3216938041. The cubic root of 138988106 is about 517.9953712262.

The spelling of 138988106 in words is "one hundred thirty-eight million, nine hundred eighty-eight thousand, one hundred six".