138688874 has 8 divisors (see below), whose sum is σ = 208395588. Its totient is φ = 69223680.

The previous prime is 138688859. The next prime is 138688877. The reversal of 138688874 is 478886831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 88491649 + 50197225 = 9407^2 + 7085^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138688877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58937 + ... + 61244.

Almost surely, 2^138688874 is an apocalyptic number.

138688874 is a deficient number, since it is larger than the sum of its proper divisors (69706714).

138688874 is a wasteful number, since it uses less digits than its factorization.

138688874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120760.

The product of its digits is 2064384, while the sum is 53.

The square root of 138688874 is about 11776.6240493615. The cubic root of 138688874 is about 517.6233677888.

The spelling of 138688874 in words is "one hundred thirty-eight million, six hundred eighty-eight thousand, eight hundred seventy-four".