9961220 has 12 divisors (see below), whose sum is σ = 20918604. Its totient is φ = 3984480.

The previous prime is 9961213. The next prime is 9961243. The reversal of 9961220 is 221699.

It can be written as a sum of positive squares in 2 ways, for example, as 5234944 + 4726276 = 2288^2 + 2174^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249011 + ... + 249050.

It is an arithmetic number, because the mean of its divisors is an integer number (1743217).

Almost surely, 2^9961220 is an apocalyptic number.

It is an amenable number.

9961220 is an abundant number, since it is smaller than the sum of its proper divisors (10957384).

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

9961220 is a wasteful number, since it uses less digits than its factorization.

9961220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498070 (or 498068 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 9961220 is about 3156.1400475898. The cubic root of 9961220 is about 215.1646116314.

The spelling of 9961220 in words is "nine million, nine hundred sixty-one thousand, two hundred twenty".