138002987 has 2 divisors, whose sum is σ = 138002988. Its totient is φ = 138002986.

The previous prime is 138002983. The next prime is 138002993. The reversal of 138002987 is 789200831.

It is a weak prime.

It is an emirp because it is prime and its reverse (789200831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138002987 - 2² = 138002983 is a prime.

It is a Chen prime.

It is equal to p_7805657 and since 138002987 and 7805657 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138002987.

It is not a weakly prime, because it can be changed into another prime (138002981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69001493 + 69001494.

It is an arithmetic number, because the mean of its divisors is an integer number (69001494).

Almost surely, 2^138002987 is an apocalyptic number.

138002987 is a deficient number, since it is larger than the sum of its proper divisors (1).

138002987 is an equidigital number, since it uses as much as digits as its factorization.

138002987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 138002987 is about 11747.4672589456. The cubic root of 138002987 is about 516.7686536559.

The spelling of 138002987 in words is "one hundred thirty-eight million, two thousand, nine hundred eighty-seven".