140845909 has 4 divisors (see below), whose sum is σ = 140930604. Its totient is φ = 140761216.

The previous prime is 140845891. The next prime is 140845949. The reversal of 140845909 is 909548041.

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 118330884 + 22515025 = 10878^2 + 4745^2 .

It is a cyclic number.

It is not a de Polignac number, because 140845909 - 2¹⁷ = 140714837 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 (140845949) 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, 39802 + ... + 43195.

It is an arithmetic number, because the mean of its divisors is an integer number (35232651).

Almost surely, 2^140845909 is an apocalyptic number.

It is an amenable number.

140845909 is a deficient number, since it is larger than the sum of its proper divisors (84695).

140845909 is an equidigital number, since it uses as much as digits as its factorization.

140845909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84694.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 140845909 is about 11867.8519117825. The cubic root of 140845909 is about 520.2931150705.

The spelling of 140845909 in words is "one hundred forty million, eight hundred forty-five thousand, nine hundred nine".