139911866 has 16 divisors (see below), whose sum is σ = 218792448. Its totient is φ = 67026000.

The previous prime is 139911859. The next prime is 139911881. The reversal of 139911866 is 668119931.

It is a happy number.

139911866 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 7 ways as a sum of consecutive naturals, for example, 4910 + ... + 17433.

It is an arithmetic number, because the mean of its divisors is an integer number (13674528).

Almost surely, 2^139911866 is an apocalyptic number.

139911866 is a deficient number, since it is larger than the sum of its proper divisors (78880582).

139911866 is a wasteful number, since it uses less digits than its factorization.

139911866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22477.

The product of its digits is 69984, while the sum is 44.

The square root of 139911866 is about 11828.4346386155. The cubic root of 139911866 is about 519.1404265327.

The spelling of 139911866 in words is "one hundred thirty-nine million, nine hundred eleven thousand, eight hundred sixty-six".