138399166 has 8 divisors (see below), whose sum is σ = 213209640. Its totient is φ = 67329288.

The previous prime is 138399133. The next prime is 138399187. The reversal of 138399166 is 661993831.

138399166 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

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, 935056 + ... + 935203.

It is an arithmetic number, because the mean of its divisors is an integer number (26651205).

Almost surely, 2^138399166 is an apocalyptic number.

138399166 is a deficient number, since it is larger than the sum of its proper divisors (74810474).

138399166 is a wasteful number, since it uses less digits than its factorization.

138399166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870298.

The product of its digits is 209952, while the sum is 46.

The square root of 138399166 is about 11764.3174897654. The cubic root of 138399166 is about 517.2626943744.

It can be divided in two parts, 13839 and 9166, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 138399166 in words is "one hundred thirty-eight million, three hundred ninety-nine thousand, one hundred sixty-six".