140443309 has 4 divisors (see below), whose sum is σ = 140593500. Its totient is φ = 140293120.

The previous prime is 140443301. The next prime is 140443321. The reversal of 140443309 is 903344041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903344041 = 13327 ⋅67783.

It can be written as a sum of positive squares in 2 ways, for example, as 117614025 + 22829284 = 10845^2 + 4778^2 .

It is a cyclic number.

It is not a de Polignac number, because 140443309 - 2³ = 140443301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140443301) 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, 73684 + ... + 75565.

It is an arithmetic number, because the mean of its divisors is an integer number (35148375).

Almost surely, 2^140443309 is an apocalyptic number.

It is an amenable number.

140443309 is a deficient number, since it is larger than the sum of its proper divisors (150191).

140443309 is an equidigital number, since it uses as much as digits as its factorization.

140443309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150190.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 140443309 is about 11850.8779843520. The cubic root of 140443309 is about 519.7968992339.

The spelling of 140443309 in words is "one hundred forty million, four hundred forty-three thousand, three hundred nine".