140440639 has 2 divisors, whose sum is σ = 140440640. Its totient is φ = 140440638.

The previous prime is 140440631. The next prime is 140440669. The reversal of 140440639 is 936044041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140440639 - 2³ = 140440631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140440639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140440631) 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, 70220319 + 70220320.

It is an arithmetic number, because the mean of its divisors is an integer number (70220320).

Almost surely, 2^140440639 is an apocalyptic number.

140440639 is a deficient number, since it is larger than the sum of its proper divisors (1).

140440639 is an equidigital number, since it uses as much as digits as its factorization.

140440639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 140440639 is about 11850.7653339352. The cubic root of 140440639 is about 519.7936052202.

The spelling of 140440639 in words is "one hundred forty million, four hundred forty thousand, six hundred thirty-nine".