139865287 has 2 divisors, whose sum is σ = 139865288. Its totient is φ = 139865286.

The previous prime is 139865281. The next prime is 139865293. The reversal of 139865287 is 782568931.

It is a balanced prime because it is at equal distance from previous prime (139865281) and next prime (139865293).

It is a cyclic number.

It is not a de Polignac number, because 139865287 - 2²³ = 131476679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139865287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139865281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69932643 + 69932644.

It is an arithmetic number, because the mean of its divisors is an integer number (69932644).

Almost surely, 2^139865287 is an apocalyptic number.

139865287 is a deficient number, since it is larger than the sum of its proper divisors (1).

139865287 is an equidigital number, since it uses as much as digits as its factorization.

139865287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 49.

The square root of 139865287 is about 11826.4655328631. The cubic root of 139865287 is about 519.0828099617.

The spelling of 139865287 in words is "one hundred thirty-nine million, eight hundred sixty-five thousand, two hundred eighty-seven".