140288809 has 4 divisors (see below), whose sum is σ = 140379904. Its totient is φ = 140197716.

The previous prime is 140288803. The next prime is 140288861. The reversal of 140288809 is 908882041.

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.

It is a cyclic number.

It is not a de Polignac number, because 140288809 - 2¹¹ = 140286761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140288803) 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, 43197 + ... + 46330.

It is an arithmetic number, because the mean of its divisors is an integer number (35094976).

Almost surely, 2^140288809 is an apocalyptic number.

It is an amenable number.

140288809 is a deficient number, since it is larger than the sum of its proper divisors (91095).

140288809 is an equidigital number, since it uses as much as digits as its factorization.

140288809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91094.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 140288809 is about 11844.3576862572. The cubic root of 140288809 is about 519.6062218510.

The spelling of 140288809 in words is "one hundred forty million, two hundred eighty-eight thousand, eight hundred nine".