9945864 has 48 divisors (see below), whose sum is σ = 27209520. Its totient is φ = 3281760.

The previous prime is 9945853. The next prime is 9945877. The reversal of 9945864 is 4685499.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7059 + ... + 8349.

It is an arithmetic number, because the mean of its divisors is an integer number (566865).

Almost surely, 2^9945864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9945864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13604760).

9945864 is an abundant number, since it is smaller than the sum of its proper divisors (17263656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9945864 is a wasteful number, since it uses less digits than its factorization.

9945864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410 (or 1403 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 9945864 is about 3153.7063908994. The cubic root of 9945864 is about 215.0539904070.

The spelling of 9945864 in words is "nine million, nine hundred forty-five thousand, eight hundred sixty-four".