140291809 has 4 divisors (see below), whose sum is σ = 160333504. Its totient is φ = 120250116.

The previous prime is 140291807. The next prime is 140291813. The reversal of 140291809 is 908192041.

140291809 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 140291809 - 2¹ = 140291807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140291807) 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, 10020837 + ... + 10020850.

It is an arithmetic number, because the mean of its divisors is an integer number (40083376).

Almost surely, 2^140291809 is an apocalyptic number.

It is an amenable number.

140291809 is a deficient number, since it is larger than the sum of its proper divisors (20041695).

140291809 is an equidigital number, since it uses as much as digits as its factorization.

140291809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20041694.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 140291809 is about 11844.4843281588. The cubic root of 140291809 is about 519.6099256569.

The spelling of 140291809 in words is "one hundred forty million, two hundred ninety-one thousand, eight hundred nine".