743421 has 8 divisors (see below), whose sum is σ = 1132864. Its totient is φ = 424800.

The previous prime is 743401. The next prime is 743423. The reversal of 743421 is 124347.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 743421 - 2⁹ = 742909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 35401 = 743421 / (7 + 4 + 3 + 4 + 2 + 1).

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17680 + ... + 17721.

It is an arithmetic number, because the mean of its divisors is an integer number (141608).

2⁷⁴³⁴²¹ is an apocalyptic number.

It is an amenable number.

743421 is a deficient number, since it is larger than the sum of its proper divisors (389443).

743421 is a wasteful number, since it uses less digits than its factorization.

743421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35411.

The product of its digits is 672, while the sum is 21.

The square root of 743421 is about 862.2186497635. The cubic root of 743421 is about 90.5895860044.

Adding to 743421 its reverse (124347), we get a palindrome (867768).

The spelling of 743421 in words is "seven hundred forty-three thousand, four hundred twenty-one", and thus it is an iban number.