1455220 has 48 divisors (see below), whose sum is σ = 3422160. Its totient is φ = 516096.

The previous prime is 1455211. The next prime is 1455227. The reversal of 1455220 is 225541.

It can be written as a sum of positive squares in 8 ways, for example, as 209764 + 1245456 = 458^2 + 1116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1455227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7444 + ... + 7636.

It is an arithmetic number, because the mean of its divisors is an integer number (71295).

2^1455220 is an apocalyptic number.

1455220 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 1455220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711080).

1455220 is an abundant number, since it is smaller than the sum of its proper divisors (1966940).

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

1455220 is a wasteful number, since it uses less digits than its factorization.

1455220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 1455220 is about 1206.3249976685. The cubic root of 1455220 is about 113.3207790784.

It can be divided in two parts, 145 and 5220, that multiplied together give a square (756900 = 870²).

The spelling of 1455220 in words is "one million, four hundred fifty-five thousand, two hundred twenty".