7849421 has 2 divisors, whose sum is σ = 7849422. Its totient is φ = 7849420.

The previous prime is 7849403. The next prime is 7849453. The reversal of 7849421 is 1249487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6375625 + 1473796 = 2525^2 + 1214^2 .

It is an emirp because it is prime and its reverse (1249487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7849421 - 2¹⁸ = 7587277 is a prime.

It is a super-2 number, since 2×7849421² = 123226820070482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7840421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3924710 + 3924711.

It is an arithmetic number, because the mean of its divisors is an integer number (3924711).

Almost surely, 2^7849421 is an apocalyptic number.

It is an amenable number.

7849421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7849421 is an equidigital number, since it uses as much as digits as its factorization.

7849421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 7849421 is about 2801.6818163382. The cubic root of 7849421 is about 198.7372186973.

The spelling of 7849421 in words is "seven million, eight hundred forty-nine thousand, four hundred twenty-one".