140340217 has 2 divisors, whose sum is σ = 140340218. Its totient is φ = 140340216.

The previous prime is 140340209. The next prime is 140340241. The reversal of 140340217 is 712043041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81649296 + 58690921 = 9036^2 + 7661^2 .

It is a cyclic number.

It is not a de Polignac number, because 140340217 - 2³ = 140340209 is a prime.

It is not a weakly prime, because it can be changed into another prime (140340817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70170108 + 70170109.

It is an arithmetic number, because the mean of its divisors is an integer number (70170109).

Almost surely, 2^140340217 is an apocalyptic number.

It is an amenable number.

140340217 is a deficient number, since it is larger than the sum of its proper divisors (1).

140340217 is an equidigital number, since it uses as much as digits as its factorization.

140340217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 140340217 is about 11846.5276347122. The cubic root of 140340217 is about 519.6696829703.

Adding to 140340217 its reverse (712043041), we get a palindrome (852383258).

The spelling of 140340217 in words is "one hundred forty million, three hundred forty thousand, two hundred seventeen".