140309 has 8 divisors (see below), whose sum is σ = 155232. Its totient is φ = 126000.

The previous prime is 140297. The next prime is 140317. The reversal of 140309 is 903041.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 140309 - 2⁸ = 140053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 140309.

It is not an unprimeable number, because it can be changed into a prime (140339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434 + ... + 684.

It is an arithmetic number, because the mean of its divisors is an integer number (19404).

2¹⁴⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

140309 is a deficient number, since it is larger than the sum of its proper divisors (14923).

140309 is a wasteful number, since it uses less digits than its factorization.

140309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 140309 is about 374.5784297046. The cubic root of 140309 is about 51.9631148681.

The spelling of 140309 in words is "one hundred forty thousand, three hundred nine".