743521 has 4 divisors (see below), whose sum is σ = 775872. Its totient is φ = 711172.

The previous prime is 743507. The next prime is 743549. The reversal of 743521 is 125347.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125347 = 163 ⋅769.

It is a cyclic number.

It is not a de Polignac number, because 743521 - 2¹¹ = 741473 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 743492 and 743501.

It is not an unprimeable number, because it can be changed into a prime (743551) 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, 16141 + ... + 16186.

It is an arithmetic number, because the mean of its divisors is an integer number (193968).

2⁷⁴³⁵²¹ is an apocalyptic number.

It is an amenable number.

743521 is a deficient number, since it is larger than the sum of its proper divisors (32351).

743521 is a wasteful number, since it uses less digits than its factorization.

743521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32350.

The product of its digits is 840, while the sum is 22.

The square root of 743521 is about 862.2766377445. The cubic root of 743521 is about 90.5936476565.

Adding to 743521 its reverse (125347), we get a palindrome (868868).

The spelling of 743521 in words is "seven hundred forty-three thousand, five hundred twenty-one".