744021 has 18 divisors (see below), whose sum is σ = 1139190. Its totient is φ = 467856.

The previous prime is 744019. The next prime is 744043. The reversal of 744021 is 120447.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 731025 + 12996 = 855^2 + 114^2 .

It is not a de Polignac number, because 744021 - 2¹ = 744019 is a prime.

It is a Curzon number.

744021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 743985 and 744003.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 744021.

It is not an unprimeable number, because it can be changed into a prime (744071) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 3135 + ... + 3363.

2⁷⁴⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

744021 is a deficient number, since it is larger than the sum of its proper divisors (395169).

744021 is a wasteful number, since it uses less digits than its factorization.

744021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 251 counting only the distinct ones).

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

The square root of 744021 is about 862.5665191740. The cubic root of 744021 is about 90.6139504562.

Adding to 744021 its reverse (120447), we get a palindrome (864468).

It can be divided in two parts, 74 and 4021, that added together give a triangular number (4095 = T₉₀).

The spelling of 744021 in words is "seven hundred forty-four thousand, twenty-one", and thus it is an iban number.