1121620 has 12 divisors (see below), whose sum is σ = 2355444. Its totient is φ = 448640.

The previous prime is 1121599. The next prime is 1121621. The reversal of 1121620 is 261211.

It can be written as a sum of positive squares in 2 ways, for example, as 234256 + 887364 = 484^2 + 942^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1121620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121621) 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, 28021 + ... + 28060.

It is an arithmetic number, because the mean of its divisors is an integer number (196287).

2^1121620 is an apocalyptic number.

1121620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121620 is an abundant number, since it is smaller than the sum of its proper divisors (1233824).

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

1121620 is a wasteful number, since it uses less digits than its factorization.

1121620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56090 (or 56088 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1121620 is about 1059.0656259175. The cubic root of 1121620 is about 103.8999283941.

Adding to 1121620 its reverse (261211), we get a palindrome (1382831).

It can be divided in two parts, 11216 and 20, that added together give a square (11236 = 106²).

The spelling of 1121620 in words is "one million, one hundred twenty-one thousand, six hundred twenty".