1220500 has 24 divisors (see below), whose sum is σ = 2666664. Its totient is φ = 488000.

The previous prime is 1220497. The next prime is 1220507. The reversal of 1220500 is 50221.

It can be written as a sum of positive squares in 4 ways, for example, as 228484 + 992016 = 478^2 + 996^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220507) 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 7 ways as a sum of consecutive naturals, for example, 721 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (111111).

2^1220500 is an apocalyptic number.

1220500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220500 is an abundant number, since it is smaller than the sum of its proper divisors (1446164).

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

1220500 is a wasteful number, since it uses less digits than its factorization.

1220500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460 (or 2448 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 1220500 is about 1104.7624178981. The cubic root of 1220500 is about 106.8675684218.

Adding to 1220500 its reverse (50221), we get a palindrome (1270721).

The spelling of 1220500 in words is "one million, two hundred twenty thousand, five hundred".