9945390 has 64 divisors (see below), whose sum is σ = 29385216. Its totient is φ = 2097792.

The previous prime is 9945359. The next prime is 9945409. The reversal of 9945390 is 935499.

It is a happy number.

9945390 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 909 + ... + 4551.

It is an arithmetic number, because the mean of its divisors is an integer number (459144).

Almost surely, 2^9945390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9945390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14692608).

9945390 is an abundant number, since it is smaller than the sum of its proper divisors (19439826).

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

9945390 is a wasteful number, since it uses less digits than its factorization.

9945390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 9945390 is about 3153.6312403323. The cubic root of 9945390 is about 215.0505740049.

The spelling of 9945390 in words is "nine million, nine hundred forty-five thousand, three hundred ninety".