2145440305 has 8 divisors (see below), whose sum is σ = 2618164800. Its totient is φ = 1687261296.

The previous prime is 2145440291. The next prime is 2145440327. The reversal of 2145440305 is 5030445412.

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

It is a cyclic number.

It is not a de Polignac number, because 2145440305 - 2⁷ = 2145440177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3636045 + ... + 3636634.

It is an arithmetic number, because the mean of its divisors is an integer number (327270600).

Almost surely, 2^2145440305 is an apocalyptic number.

It is an amenable number.

2145440305 is a deficient number, since it is larger than the sum of its proper divisors (472724495).

2145440305 is an equidigital number, since it uses as much as digits as its factorization.

2145440305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7272743.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 2145440305 is about 46318.8979251450. The cubic root of 2145440305 is about 1289.7498272953.

Adding to 2145440305 its reverse (5030445412), we get a palindrome (7175885717).

The spelling of 2145440305 in words is "two billion, one hundred forty-five million, four hundred forty thousand, three hundred five".