140284709 has 2 divisors, whose sum is σ = 140284710. Its totient is φ = 140284708.

The previous prime is 140284699. The next prime is 140284717. The reversal of 140284709 is 907482041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84364225 + 55920484 = 9185^2 + 7478^2 .

It is an emirp because it is prime and its reverse (907482041) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140284709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140284759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70142354 + 70142355.

It is an arithmetic number, because the mean of its divisors is an integer number (70142355).

Almost surely, 2^140284709 is an apocalyptic number.

It is an amenable number.

140284709 is a deficient number, since it is larger than the sum of its proper divisors (1).

140284709 is an equidigital number, since it uses as much as digits as its factorization.

140284709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 140284709 is about 11844.1846068018. The cubic root of 140284709 is about 519.6011598976.

The spelling of 140284709 in words is "one hundred forty million, two hundred eighty-four thousand, seven hundred nine".