140509 has 4 divisors (see below), whose sum is σ = 142560. Its totient is φ = 138460.

The previous prime is 140477. The next prime is 140521. The reversal of 140509 is 905041.

140509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905041 = 89 ⋅10169.

It is a cyclic number.

It is not a de Polignac number, because 140509 - 2⁵ = 140477 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 919 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (35640).

2¹⁴⁰⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

140509 is a deficient number, since it is larger than the sum of its proper divisors (2051).

140509 is an equidigital number, since it uses as much as digits as its factorization.

140509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 140509 is about 374.8453014245. The cubic root of 140509 is about 51.9877929926.

The spelling of 140509 in words is "one hundred forty thousand, five hundred nine".