139716866 has 4 divisors (see below), whose sum is σ = 209575302. Its totient is φ = 69858432.

The previous prime is 139716833. The next prime is 139716869. The reversal of 139716866 is 668617931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 101586241 + 38130625 = 10079^2 + 6175^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 139716866.

It is not an unprimeable number, because it can be changed into a prime (139716869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34929215 + ... + 34929218.

Almost surely, 2^139716866 is an apocalyptic number.

139716866 is a deficient number, since it is larger than the sum of its proper divisors (69858436).

139716866 is an equidigital number, since it uses as much as digits as its factorization.

139716866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69858435.

The product of its digits is 326592, while the sum is 47.

The square root of 139716866 is about 11820.1889155800. The cubic root of 139716866 is about 518.8991330840.

The spelling of 139716866 in words is "one hundred thirty-nine million, seven hundred sixteen thousand, eight hundred sixty-six".