138192866 has 16 divisors (see below), whose sum is σ = 237069504. Its totient is φ = 59183664.

The previous prime is 138192863. The next prime is 138192913. The reversal of 138192866 is 668291831.

138192866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138192863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25121 + ... + 30123.

It is an arithmetic number, because the mean of its divisors is an integer number (14816844).

Almost surely, 2^138192866 is an apocalyptic number.

138192866 is a deficient number, since it is larger than the sum of its proper divisors (98876638).

138192866 is a wasteful number, since it uses less digits than its factorization.

138192866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985.

The product of its digits is 124416, while the sum is 44.

The square root of 138192866 is about 11755.5461804205. The cubic root of 138192866 is about 517.0055532304.

The spelling of 138192866 in words is "one hundred thirty-eight million, one hundred ninety-two thousand, eight hundred sixty-six".