140564309 has 4 divisors (see below), whose sum is σ = 142544160. Its totient is φ = 138584460.

The previous prime is 140564273. The next prime is 140564317. The reversal of 140564309 is 903465041.

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: 903465041 = 491 ⋅1840051.

It is a cyclic number.

It is not a de Polignac number, because 140564309 - 2¹² = 140560213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140564399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989819 + ... + 989960.

It is an arithmetic number, because the mean of its divisors is an integer number (35636040).

Almost surely, 2^140564309 is an apocalyptic number.

It is an amenable number.

140564309 is a deficient number, since it is larger than the sum of its proper divisors (1979851).

140564309 is an equidigital number, since it uses as much as digits as its factorization.

140564309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979850.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 140564309 is about 11855.9819922265. The cubic root of 140564309 is about 519.9461347064.

The spelling of 140564309 in words is "one hundred forty million, five hundred sixty-four thousand, three hundred nine".