2319905945 has 16 divisors (see below), whose sum is σ = 3233745408. Its totient is φ = 1564712640.

The previous prime is 2319905941. The next prime is 2319905989. The reversal of 2319905945 is 5495099132.

It is not a de Polignac number, because 2319905945 - 2² = 2319905941 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2319905945.

It is not an unprimeable number, because it can be changed into a prime (2319905941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541169 + ... + 545438.

It is an arithmetic number, because the mean of its divisors is an integer number (202109088).

Almost surely, 2^2319905945 is an apocalyptic number.

It is an amenable number.

2319905945 is a deficient number, since it is larger than the sum of its proper divisors (913839463).

2319905945 is a wasteful number, since it uses less digits than its factorization.

2319905945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086680.

The product of its (nonzero) digits is 437400, while the sum is 47.

The square root of 2319905945 is about 48165.4019499474. The cubic root of 2319905945 is about 1323.8032997080.

The spelling of 2319905945 in words is "two billion, three hundred nineteen million, nine hundred five thousand, nine hundred forty-five".