1247220 has 108 divisors (see below), whose sum is σ = 4196556. Its totient is φ = 299520.

The previous prime is 1247209. The next prime is 1247231. The reversal of 1247220 is 227421.

It is an interprime number because it is at equal distance from previous prime (1247209) and next prime (1247231).

It can be written as a sum of positive squares in 6 ways, for example, as 571536 + 675684 = 756^2 + 822^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1247193 and 1247202.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 30400 + ... + 30440.

It is an arithmetic number, because the mean of its divisors is an integer number (38857).

2^1247220 is an apocalyptic number.

1247220 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 1247220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2098278).

1247220 is an abundant number, since it is smaller than the sum of its proper divisors (2949336).

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

1247220 is a wasteful number, since it uses less digits than its factorization.

1247220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1247220 is about 1116.7900429356. The cubic root of 1247220 is about 107.6418175146.

The spelling of 1247220 in words is "one million, two hundred forty-seven thousand, two hundred twenty".