743021 has 4 divisors (see below), whose sum is σ = 745500. Its totient is φ = 740544.

The previous prime is 742999. The next prime is 743027. The reversal of 743021 is 120347.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120347 = 151 ⋅797.

It can be written as a sum of positive squares in 2 ways, for example, as 366025 + 376996 = 605^2 + 614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-743021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716 + ... + 1413.

It is an arithmetic number, because the mean of its divisors is an integer number (186375).

2⁷⁴³⁰²¹ is an apocalyptic number.

It is an amenable number.

743021 is a deficient number, since it is larger than the sum of its proper divisors (2479).

743021 is a wasteful number, since it uses less digits than its factorization.

743021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 743021 is about 861.9866588295. The cubic root of 743021 is about 90.5733357526.

Adding to 743021 its reverse (120347), we get a palindrome (863368).

The spelling of 743021 in words is "seven hundred forty-three thousand, twenty-one", and thus it is an iban number.