1072809865 has 8 divisors (see below), whose sum is σ = 1290018240. Its totient is φ = 856483632.

The previous prime is 1072809853. The next prime is 1072809883. The reversal of 1072809865 is 5689082701.

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 1072809865 - 2⁵ = 1072809833 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217855 + ... + 222724.

It is an arithmetic number, because the mean of its divisors is an integer number (161252280).

Almost surely, 2^1072809865 is an apocalyptic number.

It is an amenable number.

1072809865 is a deficient number, since it is larger than the sum of its proper divisors (217208375).

1072809865 is an equidigital number, since it uses as much as digits as its factorization.

1072809865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441071.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 1072809865 is about 32753.7763471634. The cubic root of 1072809865 is about 1023.7036524573.

The spelling of 1072809865 in words is "one billion, seventy-two million, eight hundred nine thousand, eight hundred sixty-five".