139819387 has 2 divisors, whose sum is σ = 139819388. Its totient is φ = 139819386.

The previous prime is 139819367. The next prime is 139819391. The reversal of 139819387 is 783918931.

It is a strong prime.

It is an emirp because it is prime and its reverse (783918931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139819387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139819387.

It is not a weakly prime, because it can be changed into another prime (139819327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69909693 + 69909694.

It is an arithmetic number, because the mean of its divisors is an integer number (69909694).

Almost surely, 2^139819387 is an apocalyptic number.

139819387 is a deficient number, since it is larger than the sum of its proper divisors (1).

139819387 is an equidigital number, since it uses as much as digits as its factorization.

139819387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 139819387 is about 11824.5248107482. The cubic root of 139819387 is about 519.0260207748.

The spelling of 139819387 in words is "one hundred thirty-nine million, eight hundred nineteen thousand, three hundred eighty-seven".