9966390 has 32 divisors (see below), whose sum is σ = 27336960. Its totient is φ = 2277984.

The previous prime is 9966389. The next prime is 9966409. The reversal of 9966390 is 936699.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23520 + ... + 23939.

It is an arithmetic number, because the mean of its divisors is an integer number (854280).

Almost surely, 2^9966390 is an apocalyptic number.

9966390 is an abundant number, since it is smaller than the sum of its proper divisors (17370570).

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

9966390 is a wasteful number, since it uses less digits than its factorization.

9966390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47476.

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 9966390 is about 3156.9589797778. The cubic root of 9966390 is about 215.2018295842.

The spelling of 9966390 in words is "nine million, nine hundred sixty-six thousand, three hundred ninety".