140639 has 2 divisors, whose sum is σ = 140640. Its totient is φ = 140638.

The previous prime is 140629. The next prime is 140659. The reversal of 140639 is 936041.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140639 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70319 + 70320.

It is an arithmetic number, because the mean of its divisors is an integer number (70320).

2¹⁴⁰⁶³⁹ is an apocalyptic number.

140639 is a deficient number, since it is larger than the sum of its proper divisors (1).

140639 is an equidigital number, since it uses as much as digits as its factorization.

140639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 140639 is about 375.0186662021. The cubic root of 140639 is about 52.0038212182.

The spelling of 140639 in words is "one hundred forty thousand, six hundred thirty-nine".