1965945309 has 16 divisors (see below), whose sum is σ = 2809156992. Its totient is φ = 1219762368.

The previous prime is 1965945299. The next prime is 1965945329. The reversal of 1965945309 is 9035495691.

It is not a de Polignac number, because 1965945309 - 2⁹ = 1965944797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965945329) 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, 382474 + ... + 387579.

It is an arithmetic number, because the mean of its divisors is an integer number (175572312).

Almost surely, 2^1965945309 is an apocalyptic number.

It is an amenable number.

1965945309 is a deficient number, since it is larger than the sum of its proper divisors (843211683).

1965945309 is a wasteful number, since it uses less digits than its factorization.

1965945309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770116.

The product of its (nonzero) digits is 1312200, while the sum is 51.

The square root of 1965945309 is about 44338.9818218687. The cubic root of 1965945309 is about 1252.7290368039.

The spelling of 1965945309 in words is "one billion, nine hundred sixty-five million, nine hundred forty-five thousand, three hundred nine".