140243639 has 2 divisors, whose sum is σ = 140243640. Its totient is φ = 140243638.

The previous prime is 140243603. The next prime is 140243641. The reversal of 140243639 is 936342041.

It is a strong prime.

It is an emirp because it is prime and its reverse (936342041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140243639 - 2¹² = 140239543 is a prime.

It is a Sophie Germain prime.

Together with 140243641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140243699) 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, 70121819 + 70121820.

It is an arithmetic number, because the mean of its divisors is an integer number (70121820).

Almost surely, 2^140243639 is an apocalyptic number.

140243639 is a deficient number, since it is larger than the sum of its proper divisors (1).

140243639 is an equidigital number, since it uses as much as digits as its factorization.

140243639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 140243639 is about 11842.4507176513. The cubic root of 140243639 is about 519.5504484963.

The spelling of 140243639 in words is "one hundred forty million, two hundred forty-three thousand, six hundred thirty-nine".