140815309 has 4 divisors (see below), whose sum is σ = 141545116. Its totient is φ = 140085504.

The previous prime is 140815291. The next prime is 140815319. The reversal of 140815309 is 903518041.

140815309 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.

It can be written as a sum of positive squares in 2 ways, for example, as 62758084 + 78057225 = 7922^2 + 8835^2 .

It is a cyclic number.

It is not a de Polignac number, because 140815309 - 2¹⁵ = 140782541 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 (140815319) 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, 364614 + ... + 364999.

It is an arithmetic number, because the mean of its divisors is an integer number (35386279).

Almost surely, 2^140815309 is an apocalyptic number.

It is an amenable number.

140815309 is a deficient number, since it is larger than the sum of its proper divisors (729807).

140815309 is an equidigital number, since it uses as much as digits as its factorization.

140815309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729806.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 140815309 is about 11866.5626446752. The cubic root of 140815309 is about 520.2554329384.

The spelling of 140815309 in words is "one hundred forty million, eight hundred fifteen thousand, three hundred nine".