1221250 has 20 divisors (see below), whose sum is σ = 2291454. Its totient is φ = 488000.

The previous prime is 1221247. The next prime is 1221251. The reversal of 1221250 is 521221.

It can be written as a sum of positive squares in 5 ways, for example, as 162409 + 1058841 = 403^2 + 1029^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221250.

It is not an unprimeable number, because it can be changed into a prime (1221251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 762 + ... + 1738.

2^1221250 is an apocalyptic number.

1221250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221250 is a deficient number, since it is larger than the sum of its proper divisors (1070204).

1221250 is an frugal number, since it uses more digits than its factorization.

1221250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1221250 is about 1105.1018052650. The cubic root of 1221250 is about 106.8894540601.

Adding to 1221250 its reverse (521221), we get a palindrome (1742471).

The spelling of 1221250 in words is "one million, two hundred twenty-one thousand, two hundred fifty".