9945865 has 8 divisors (see below), whose sum is σ = 11952000. Its totient is φ = 7945392.

The previous prime is 9945853. The next prime is 9945877. The reversal of 9945865 is 5685499.

It is an interprime number because it is at equal distance from previous prime (9945853) and next prime (9945877).

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 9945865 - 2¹⁵ = 9913097 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5886 + ... + 7384.

It is an arithmetic number, because the mean of its divisors is an integer number (1494000).

Almost surely, 2^9945865 is an apocalyptic number.

It is an amenable number.

9945865 is a deficient number, since it is larger than the sum of its proper divisors (2006135).

9945865 is a wasteful number, since it uses less digits than its factorization.

9945865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831.

The product of its digits is 388800, while the sum is 46.

The square root of 9945865 is about 3153.7065494431. The cubic root of 9945865 is about 215.0539976145.

It can be divided in two parts, 994 and 5865, that added together give a cube (6859 = 19³).

The spelling of 9945865 in words is "nine million, nine hundred forty-five thousand, eight hundred sixty-five".