1220000 has 60 divisors (see below), whose sum is σ = 3050586. Its totient is φ = 480000.

The previous prime is 1219991. The next prime is 1220027. The reversal of 1220000 is 221.

1220000 = T₁₀₉ + T₁₁₀ + ... + T₂₀₄.

It can be written as a sum of positive squares in 5 ways, for example, as 44944 + 1175056 = 212^2 + 1084^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19970 + ... + 20030.

2^1220000 is an apocalyptic number.

1220000 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 1220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1525293).

1220000 is an abundant number, since it is smaller than the sum of its proper divisors (1830586).

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

1220000 is an frugal number, since it uses more digits than its factorization.

1220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 1220000 is about 1104.5361017187. The cubic root of 1220000 is about 106.8529730149.

Adding to 1220000 its reverse (221), we get a palindrome (1220221).

The spelling of 1220000 in words is "one million, two hundred twenty thousand".