140320987 has 2 divisors, whose sum is σ = 140320988. Its totient is φ = 140320986.

The previous prime is 140320967. The next prime is 140321021. The reversal of 140320987 is 789023041.

It is an a-pointer prime, because the next prime (140321021) can be obtained adding 140320987 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140320987 is a prime.

It is not a weakly prime, because it can be changed into another prime (140320927) 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, 70160493 + 70160494.

It is an arithmetic number, because the mean of its divisors is an integer number (70160494).

Almost surely, 2^140320987 is an apocalyptic number.

140320987 is a deficient number, since it is larger than the sum of its proper divisors (1).

140320987 is an equidigital number, since it uses as much as digits as its factorization.

140320987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 140320987 is about 11845.7159766727. The cubic root of 140320987 is about 519.6459461192.

The spelling of 140320987 in words is "one hundred forty million, three hundred twenty thousand, nine hundred eighty-seven".