140230309 has 4 divisors (see below), whose sum is σ = 140627916. Its totient is φ = 139832704.

The previous prime is 140230301. The next prime is 140230327. The reversal of 140230309 is 903032041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903032041 = 857 ⋅1053713.

It can be written as a sum of positive squares in 2 ways, for example, as 18679684 + 121550625 = 4322^2 + 11025^2 .

It is a cyclic number.

It is not a de Polignac number, because 140230309 - 2³ = 140230301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140230309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140230301) 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, 198274 + ... + 198979.

It is an arithmetic number, because the mean of its divisors is an integer number (35156979).

Almost surely, 2^140230309 is an apocalyptic number.

It is an amenable number.

140230309 is a deficient number, since it is larger than the sum of its proper divisors (397607).

140230309 is an equidigital number, since it uses as much as digits as its factorization.

140230309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397606.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 140230309 is about 11841.8878984729. The cubic root of 140230309 is about 519.5339870797.

The spelling of 140230309 in words is "one hundred forty million, two hundred thirty thousand, three hundred nine".