139072987 has 2 divisors, whose sum is σ = 139072988. Its totient is φ = 139072986.

The previous prime is 139072981. The next prime is 139072993. The reversal of 139072987 is 789270931.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (139072981) and next prime (139072993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139072987 is a prime.

It is not a weakly prime, because it can be changed into another prime (139072981) 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, 69536493 + 69536494.

It is an arithmetic number, because the mean of its divisors is an integer number (69536494).

Almost surely, 2^139072987 is an apocalyptic number.

139072987 is a deficient number, since it is larger than the sum of its proper divisors (1).

139072987 is an equidigital number, since it uses as much as digits as its factorization.

139072987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 139072987 is about 11792.9210545988. The cubic root of 139072987 is about 518.1007975558.

The spelling of 139072987 in words is "one hundred thirty-nine million, seventy-two thousand, nine hundred eighty-seven".