140687917 has 4 divisors (see below), whose sum is σ = 143342460. Its totient is φ = 138033376.

The previous prime is 140687893. The next prime is 140687923. The reversal of 140687917 is 719786041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79941481 + 60746436 = 8941^2 + 7794^2 .

It is a cyclic number.

It is not a de Polignac number, because 140687917 - 2¹¹ = 140685869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140687947) 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 in 3 ways as a sum of consecutive naturals, for example, 1327192 + ... + 1327297.

It is an arithmetic number, because the mean of its divisors is an integer number (35835615).

Almost surely, 2^140687917 is an apocalyptic number.

It is an amenable number.

140687917 is a deficient number, since it is larger than the sum of its proper divisors (2654543).

140687917 is an equidigital number, since it uses as much as digits as its factorization.

140687917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654542.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 140687917 is about 11861.1937426214. The cubic root of 140687917 is about 520.0984983531.

The spelling of 140687917 in words is "one hundred forty million, six hundred eighty-seven thousand, nine hundred seventeen".