1445220 has 144 divisors (see below), whose sum is σ = 5311488. Its totient is φ = 311040.

The previous prime is 1445207. The next prime is 1445237. The reversal of 1445220 is 225441.

1445220 is a `hidden beast` number, since 1 + 445 + 220 = 666.

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 = 1445193 and 1445202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39042 + ... + 39078.

2^1445220 is an apocalyptic number.

1445220 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 1445220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2655744).

1445220 is an abundant number, since it is smaller than the sum of its proper divisors (3866268).

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

1445220 is a wasteful number, since it uses less digits than its factorization.

1445220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1445220 is about 1202.1730324708. The cubic root of 1445220 is about 113.0606091438.

The spelling of 1445220 in words is "one million, four hundred forty-five thousand, two hundred twenty".