138438634 has 8 divisors (see below), whose sum is σ = 214818660. Its totient is φ = 66832416.

The previous prime is 138438607. The next prime is 138438647. The reversal of 138438634 is 436834831.

It can be written as a sum of positive squares in 2 ways, for example, as 138415225 + 23409 = 11765^2 + 153^2 .

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, 1193379 + ... + 1193494.

Almost surely, 2^138438634 is an apocalyptic number.

138438634 is a deficient number, since it is larger than the sum of its proper divisors (76380026).

138438634 is a wasteful number, since it uses less digits than its factorization.

138438634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386904.

The product of its digits is 165888, while the sum is 40.

The square root of 138438634 is about 11765.9948155691. The cubic root of 138438634 is about 517.3118598530.

The spelling of 138438634 in words is "one hundred thirty-eight million, four hundred thirty-eight thousand, six hundred thirty-four".