743220 has 36 divisors (see below), whose sum is σ = 2254980. Its totient is φ = 198144.

The previous prime is 743209. The next prime is 743221. The reversal of 743220 is 22347.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 338724 + 404496 = 582^2 + 636^2 .

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 a nialpdrome in base 10 and base 15.

It is a junction number, because it is equal to n+sod(n) for n = 743193 and 743202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743221) by changing a digit.

743220 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 1885 + ... + 2244.

2⁷⁴³²²⁰ is an apocalyptic number.

It is an amenable number.

743220 is an abundant number, since it is smaller than the sum of its proper divisors (1511760).

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

743220 is a wasteful number, since it uses less digits than its factorization.

743220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144 (or 4139 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 743220 is about 862.1020821225. The cubic root of 743220 is about 90.5814209816.

Adding to 743220 its reverse (22347), we get a palindrome (765567).

The spelling of 743220 in words is "seven hundred forty-three thousand, two hundred twenty", and thus it is an iban number.