1251220 has 24 divisors (see below), whose sum is σ = 2666664. Its totient is φ = 493056.

The previous prime is 1251179. The next prime is 1251227. The reversal of 1251220 is 221521.

It can be written as a sum of positive squares in 4 ways, for example, as 412164 + 839056 = 642^2 + 916^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1251220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1032 + ... + 1888.

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

2^1251220 is an apocalyptic number.

1251220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251220 is an abundant number, since it is smaller than the sum of its proper divisors (1415444).

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

1251220 is a wasteful number, since it uses less digits than its factorization.

1251220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 937 counting only the distinct ones).

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

The square root of 1251220 is about 1118.5794562748. The cubic root of 1251220 is about 107.7567685773.

Adding to 1251220 its reverse (221521), we get a palindrome (1472741).

The spelling of 1251220 in words is "one million, two hundred fifty-one thousand, two hundred twenty".