140273809 has 8 divisors (see below), whose sum is σ = 151694312. Its totient is φ = 128943360.

The previous prime is 140273779. The next prime is 140273843. The reversal of 140273809 is 908372041.

It can be written as a sum of positive squares in 4 ways, for example, as 23309584 + 116964225 = 4828^2 + 10815^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-140273809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140273509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19254 + ... + 25519.

It is an arithmetic number, because the mean of its divisors is an integer number (18961789).

Almost surely, 2^140273809 is an apocalyptic number.

It is an amenable number.

140273809 is a deficient number, since it is larger than the sum of its proper divisors (11420503).

140273809 is a wasteful number, since it uses less digits than its factorization.

140273809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45027.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 140273809 is about 11843.7244564368. The cubic root of 140273809 is about 519.5877020294.

The spelling of 140273809 in words is "one hundred forty million, two hundred seventy-three thousand, eight hundred nine".