1355220 has 36 divisors (see below), whose sum is σ = 4111380. Its totient is φ = 361344.

The previous prime is 1355219. The next prime is 1355243. The reversal of 1355220 is 225531.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 467856 + 887364 = 684^2 + 942^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an Ulam number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 1355193 and 1355202.

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 11 ways as a sum of consecutive naturals, for example, 3585 + ... + 3944.

It is an arithmetic number, because the mean of its divisors is an integer number (114205).

2^1355220 is an apocalyptic number.

1355220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1355220 is an abundant number, since it is smaller than the sum of its proper divisors (2756160).

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

1355220 is a wasteful number, since it uses less digits than its factorization.

1355220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7544 (or 7539 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 1355220 is about 1164.1391669384. The cubic root of 1355220 is about 110.6632109693.

The spelling of 1355220 in words is "one million, three hundred fifty-five thousand, two hundred twenty".