7742321 has 2 divisors, whose sum is σ = 7742322. Its totient is φ = 7742320.

The previous prime is 7742309. The next prime is 7742341. The reversal of 7742321 is 1232477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6431296 + 1311025 = 2536^2 + 1145^2 .

It is an emirp because it is prime and its reverse (1232477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7742321 - 2¹⁰ = 7741297 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7742341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3871160 + 3871161.

It is an arithmetic number, because the mean of its divisors is an integer number (3871161).

Almost surely, 2^7742321 is an apocalyptic number.

It is an amenable number.

7742321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7742321 is an equidigital number, since it uses as much as digits as its factorization.

7742321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 26.

The square root of 7742321 is about 2782.5026504929. The cubic root of 7742321 is about 197.8291983480.

Adding to 7742321 its reverse (1232477), we get a palindrome (8974798).

The spelling of 7742321 in words is "seven million, seven hundred forty-two thousand, three hundred twenty-one".