140305247 has 2 divisors, whose sum is σ = 140305248. Its totient is φ = 140305246.

The previous prime is 140305237. The next prime is 140305283. The reversal of 140305247 is 742503041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140305247 - 2¹⁰ = 140304223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140305237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70152623 + 70152624.

It is an arithmetic number, because the mean of its divisors is an integer number (70152624).

Almost surely, 2^140305247 is an apocalyptic number.

140305247 is a deficient number, since it is larger than the sum of its proper divisors (1).

140305247 is an equidigital number, since it uses as much as digits as its factorization.

140305247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 140305247 is about 11845.0515828341. The cubic root of 140305247 is about 519.6265155902.

Adding to 140305247 its reverse (742503041), we get a palindrome (882808288).

The spelling of 140305247 in words is "one hundred forty million, three hundred five thousand, two hundred forty-seven".