138216994 has 8 divisors (see below), whose sum is σ = 207952848. Its totient is φ = 68899380.

The previous prime is 138216983. The next prime is 138217043. The reversal of 138216994 is 499612831.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 138216994.

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, 103732 + ... + 105055.

It is an arithmetic number, because the mean of its divisors is an integer number (25994106).

Almost surely, 2^138216994 is an apocalyptic number.

138216994 is a deficient number, since it is larger than the sum of its proper divisors (69735854).

138216994 is a wasteful number, since it uses less digits than its factorization.

138216994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209120.

The product of its digits is 93312, while the sum is 43.

The square root of 138216994 is about 11756.5723746337. The cubic root of 138216994 is about 517.0356406110.

The spelling of 138216994 in words is "one hundred thirty-eight million, two hundred sixteen thousand, nine hundred ninety-four".