139866479 has 2 divisors, whose sum is σ = 139866480. Its totient is φ = 139866478.

The previous prime is 139866443. The next prime is 139866499. The reversal of 139866479 is 974668931.

139866479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (974668931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139866479 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139866479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139866439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69933239 + 69933240.

It is an arithmetic number, because the mean of its divisors is an integer number (69933240).

Almost surely, 2^139866479 is an apocalyptic number.

139866479 is a deficient number, since it is larger than the sum of its proper divisors (1).

139866479 is an equidigital number, since it uses as much as digits as its factorization.

139866479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 139866479 is about 11826.5159282013. The cubic root of 139866479 is about 519.0842845829.

The spelling of 139866479 in words is "one hundred thirty-nine million, eight hundred sixty-six thousand, four hundred seventy-nine".