139166986 has 32 divisors (see below), whose sum is σ = 245341440. Its totient is φ = 57974400.

The previous prime is 139166977. The next prime is 139167037. The reversal of 139166986 is 689661931.

139166986 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75091 + ... + 76921.

It is an arithmetic number, because the mean of its divisors is an integer number (7666920).

Almost surely, 2^139166986 is an apocalyptic number.

139166986 is a deficient number, since it is larger than the sum of its proper divisors (106174454).

139166986 is a wasteful number, since it uses less digits than its factorization.

139166986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990.

The product of its digits is 419904, while the sum is 49.

The square root of 139166986 is about 11796.9057807545. The cubic root of 139166986 is about 518.2174988404.

It can be divided in two parts, 13916 and 6986, that added together give a palindrome (20902).

The spelling of 139166986 in words is "one hundred thirty-nine million, one hundred sixty-six thousand, nine hundred eighty-six".