138199994 has 8 divisors (see below), whose sum is σ = 207426420. Its totient is φ = 69057856.

The previous prime is 138199981. The next prime is 138200011. The reversal of 138199994 is 499991831.

138199994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 120450625 + 17749369 = 10975^2 + 4213^2 .

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, 16799 + ... + 23634.

Almost surely, 2^138199994 is an apocalyptic number.

138199994 is a deficient number, since it is larger than the sum of its proper divisors (69226426).

138199994 is a wasteful number, since it uses less digits than its factorization.

138199994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42144.

The product of its digits is 629856, while the sum is 53.

The square root of 138199994 is about 11755.8493525564. The cubic root of 138199994 is about 517.0144421413.

The spelling of 138199994 in words is "one hundred thirty-eight million, one hundred ninety-nine thousand, nine hundred ninety-four".