139417987 has 2 divisors, whose sum is σ = 139417988. Its totient is φ = 139417986.

The previous prime is 139417979. The next prime is 139418011. The reversal of 139417987 is 789714931.

It is a weak prime.

It is an emirp because it is prime and its reverse (789714931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139417987 - 2³ = 139417979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139417987.

It is not a weakly prime, because it can be changed into another prime (139417387) 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, 69708993 + 69708994.

It is an arithmetic number, because the mean of its divisors is an integer number (69708994).

Almost surely, 2^139417987 is an apocalyptic number.

139417987 is a deficient number, since it is larger than the sum of its proper divisors (1).

139417987 is an equidigital number, since it uses as much as digits as its factorization.

139417987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 139417987 is about 11807.5394134426. The cubic root of 139417987 is about 518.5288633689.

The spelling of 139417987 in words is "one hundred thirty-nine million, four hundred seventeen thousand, nine hundred eighty-seven".