138688052 has 12 divisors (see below), whose sum is σ = 243394116. Its totient is φ = 69146880.

The previous prime is 138688051. The next prime is 138688073. The reversal of 138688052 is 250886831.

It can be written as a sum of positive squares in 2 ways, for example, as 29986576 + 108701476 = 5476^2 + 10426^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138688051) 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, 47699 + ... + 50522.

It is an arithmetic number, because the mean of its divisors is an integer number (20282843).

Almost surely, 2^138688052 is an apocalyptic number.

It is an amenable number.

138688052 is a deficient number, since it is larger than the sum of its proper divisors (104706064).

138688052 is a wasteful number, since it uses less digits than its factorization.

138688052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98578 (or 98576 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 138688052 is about 11776.5891496647. The cubic root of 138688052 is about 517.6223451467.

The spelling of 138688052 in words is "one hundred thirty-eight million, six hundred eighty-eight thousand, fifty-two".