139189666 has 32 divisors (see below), whose sum is σ = 262766592. Its totient is φ = 53716560.

The previous prime is 139189643. The next prime is 139189679. The reversal of 139189666 is 666981931.

139189666 is digitally balanced in base 2, 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, 12255 + ... + 20701.

It is an arithmetic number, because the mean of its divisors is an integer number (8211456).

Almost surely, 2^139189666 is an apocalyptic number.

139189666 is a deficient number, since it is larger than the sum of its proper divisors (123576926).

139189666 is a wasteful number, since it uses less digits than its factorization.

139189666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8574.

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

The square root of 139189666 is about 11797.8670106083. The cubic root of 139189666 is about 518.2456485590.

The spelling of 139189666 in words is "one hundred thirty-nine million, one hundred eighty-nine thousand, six hundred sixty-six".