9121820 has 12 divisors (see below), whose sum is σ = 19155864. Its totient is φ = 3648720.

The previous prime is 9121799. The next prime is 9121829. The reversal of 9121820 is 281219.

It is a super-2 number, since 2×9121820² = 166415200224800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9121829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228026 + ... + 228065.

It is an arithmetic number, because the mean of its divisors is an integer number (1596322).

Almost surely, 2^9121820 is an apocalyptic number.

It is an amenable number.

9121820 is an abundant number, since it is smaller than the sum of its proper divisors (10034044).

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

9121820 is a wasteful number, since it uses less digits than its factorization.

9121820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456100 (or 456098 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 9121820 is about 3020.2350901875. The cubic root of 9121820 is about 208.9426824806.

The spelling of 9121820 in words is "nine million, one hundred twenty-one thousand, eight hundred twenty".