140243647 has 2 divisors, whose sum is σ = 140243648. Its totient is φ = 140243646.

The previous prime is 140243641. The next prime is 140243699. The reversal of 140243647 is 746342041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140243647 - 2³ = 140243639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140243641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70121823 + 70121824.

It is an arithmetic number, because the mean of its divisors is an integer number (70121824).

Almost surely, 2^140243647 is an apocalyptic number.

140243647 is a deficient number, since it is larger than the sum of its proper divisors (1).

140243647 is an equidigital number, since it uses as much as digits as its factorization.

140243647 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 31.

The square root of 140243647 is about 11842.4510554192. The cubic root of 140243647 is about 519.5504583753.

Adding to 140243647 its reverse (746342041), we get a palindrome (886585688).

It can be divided in two parts, 14024 and 3647, that added together give a palindrome (17671).

The spelling of 140243647 in words is "one hundred forty million, two hundred forty-three thousand, six hundred forty-seven".