742321 has 4 divisors (see below), whose sum is σ = 749632. Its totient is φ = 735012.

The previous prime is 742307. The next prime is 742327. The reversal of 742321 is 123247.

742321 is nontrivially palindromic in base 7.

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: 123247 = 37 ⋅3331.

It is a cyclic number.

It is not a de Polignac number, because 742321 - 2⁵ = 742289 is a prime.

It is a Duffinian number.

742321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (742327) 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 3 ways as a sum of consecutive naturals, for example, 3501 + ... + 3706.

It is an arithmetic number, because the mean of its divisors is an integer number (187408).

2⁷⁴²³²¹ is an apocalyptic number.

It is an amenable number.

742321 is a deficient number, since it is larger than the sum of its proper divisors (7311).

742321 is a wasteful number, since it uses less digits than its factorization.

742321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7310.

The product of its digits is 336, while the sum is 19.

The square root of 742321 is about 861.5805243853. The cubic root of 742321 is about 90.5448837727.

Adding to 742321 its reverse (123247), we get a palindrome (865568).

The spelling of 742321 in words is "seven hundred forty-two thousand, three hundred twenty-one", and thus it is an iban number.