138866199 has 4 divisors (see below), whose sum is σ = 185154936. Its totient is φ = 92577464.

The previous prime is 138866197. The next prime is 138866209. The reversal of 138866199 is 991668831.

138866199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138866199 - 2¹ = 138866197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138866191) 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, 23144364 + ... + 23144369.

It is an arithmetic number, because the mean of its divisors is an integer number (46288734).

Almost surely, 2^138866199 is an apocalyptic number.

138866199 is a deficient number, since it is larger than the sum of its proper divisors (46288737).

138866199 is an equidigital number, since it uses as much as digits as its factorization.

138866199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46288736.

The product of its digits is 559872, while the sum is 51.

The square root of 138866199 is about 11784.1503299983. The cubic root of 138866199 is about 517.8438816857.

The spelling of 138866199 in words is "one hundred thirty-eight million, eight hundred sixty-six thousand, one hundred ninety-nine".