140665687 has 2 divisors, whose sum is σ = 140665688. Its totient is φ = 140665686.

The previous prime is 140665669. The next prime is 140665751. The reversal of 140665687 is 786566041.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (786566041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140665687 - 2¹¹ = 140663639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140665627) 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, 70332843 + 70332844.

It is an arithmetic number, because the mean of its divisors is an integer number (70332844).

Almost surely, 2^140665687 is an apocalyptic number.

140665687 is a deficient number, since it is larger than the sum of its proper divisors (1).

140665687 is an equidigital number, since it uses as much as digits as its factorization.

140665687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 140665687 is about 11860.2566161108. The cubic root of 140665687 is about 520.0711034427.

The spelling of 140665687 in words is "one hundred forty million, six hundred sixty-five thousand, six hundred eighty-seven".