7814321 has 2 divisors, whose sum is σ = 7814322. Its totient is φ = 7814320.

The previous prime is 7814309. The next prime is 7814341. The reversal of 7814321 is 1234187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 1132096 = 2585^2 + 1064^2 .

It is an emirp because it is prime and its reverse (1234187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7814321 - 2¹⁰ = 7813297 is a prime.

It is a super-2 number, since 2×7814321² = 122127225382082, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (7814341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3907160 + 3907161.

It is an arithmetic number, because the mean of its divisors is an integer number (3907161).

Almost surely, 2^7814321 is an apocalyptic number.

It is an amenable number.

7814321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7814321 is an equidigital number, since it uses as much as digits as its factorization.

7814321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 7814321 is about 2795.4107032778. The cubic root of 7814321 is about 198.4405471374.

The spelling of 7814321 in words is "seven million, eight hundred fourteen thousand, three hundred twenty-one".