1023965865 has 48 divisors (see below), whose sum is σ = 1994533632. Its totient is φ = 482182272.

The previous prime is 1023965851. The next prime is 1023965983. The reversal of 1023965865 is 5685693201.

1023965865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1023965865 - 2⁸ = 1023965609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1023965865.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24597 + ... + 51506.

It is an arithmetic number, because the mean of its divisors is an integer number (41552784).

Almost surely, 2^1023965865 is an apocalyptic number.

1023965865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1023965865 is a deficient number, since it is larger than the sum of its proper divisors (970567767).

1023965865 is a wasteful number, since it uses less digits than its factorization.

1023965865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76150 (or 76147 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 1023965865 is about 31999.4666361800. The cubic root of 1023965865 is about 1007.9256399464.

The spelling of 1023965865 in words is "one billion, twenty-three million, nine hundred sixty-five thousand, eight hundred sixty-five".