9945858 has 32 divisors (see below), whose sum is σ = 21885696. Its totient is φ = 2994048.

The previous prime is 9945853. The next prime is 9945877. The reversal of 9945858 is 8585499.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945853) 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, 2310 + ... + 5022.

It is an arithmetic number, because the mean of its divisors is an integer number (683928).

Almost surely, 2^9945858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9945858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10942848).

9945858 is an abundant number, since it is smaller than the sum of its proper divisors (11939838).

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

9945858 is a wasteful number, since it uses less digits than its factorization.

9945858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778.

The product of its digits is 518400, while the sum is 48.

The square root of 9945858 is about 3153.7054396376. The cubic root of 9945858 is about 215.0539471621.

The spelling of 9945858 in words is "nine million, nine hundred forty-five thousand, eight hundred fifty-eight".