1005715865 has 16 divisors (see below), whose sum is σ = 1504656000. Its totient is φ = 626939520.

The previous prime is 1005715861. The next prime is 1005715873. The reversal of 1005715865 is 5685175001.

It is a happy number.

1005715865 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 1005715865 - 2² = 1005715861 is a prime.

It is a super-2 number, since 2×1005715865² = 2022928802225396450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1005715861) 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, 1305740 + ... + 1306509.

It is an arithmetic number, because the mean of its divisors is an integer number (94041000).

Almost surely, 2^1005715865 is an apocalyptic number.

It is an amenable number.

1005715865 is a deficient number, since it is larger than the sum of its proper divisors (498940135).

1005715865 is a wasteful number, since it uses less digits than its factorization.

1005715865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612272.

The product of its (nonzero) digits is 42000, while the sum is 38.

The square root of 1005715865 is about 31713.0235865330. The cubic root of 1005715865 is about 1001.9016696933.

The spelling of 1005715865 in words is "one billion, five million, seven hundred fifteen thousand, eight hundred sixty-five".