911820 has 96 divisors (see below), whose sum is σ = 3161088. Its totient is φ = 191232.

The previous prime is 911819. The next prime is 911831. The reversal of 911820 is 28119.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 5377 + ... + 5543.

It is an arithmetic number, because the mean of its divisors is an integer number (32928).

2⁹¹¹⁸²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 911820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1580544).

911820 is an abundant number, since it is smaller than the sum of its proper divisors (2249268).

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

911820 is a wasteful number, since it uses less digits than its factorization.

911820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 911820 is about 954.8926641251. The cubic root of 911820 is about 96.9697712870.

Adding to 911820 its reverse (28119), we get a palindrome (939939).

The spelling of 911820 in words is "nine hundred eleven thousand, eight hundred twenty".