1011220 has 48 divisors (see below), whose sum is σ = 2515968. Its totient is φ = 334080.

The previous prime is 1011217. The next prime is 1011221. The reversal of 1011220 is 221101.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4224 + ... + 4456.

It is an arithmetic number, because the mean of its divisors is an integer number (52416).

2^1011220 is an apocalyptic number.

1011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1257984).

1011220 is an abundant number, since it is smaller than the sum of its proper divisors (1504748).

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

1011220 is a wasteful number, since it uses less digits than its factorization.

1011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1011220 is about 1005.5943516150. The cubic root of 1011220 is about 100.3726098943.

Adding to 1011220 its reverse (221101), we get a palindrome (1232321).

The spelling of 1011220 in words is "one million, eleven thousand, two hundred twenty".