7840849 has 2 divisors, whose sum is σ = 7840850. Its totient is φ = 7840848.

The previous prime is 7840841. The next prime is 7840867. The reversal of 7840849 is 9480487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7800849 + 40000 = 2793^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 7840849 - 2³ = 7840841 is a prime.

It is a super-2 number, since 2×7840849² = 122957826081602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7840841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3920424 + 3920425.

It is an arithmetic number, because the mean of its divisors is an integer number (3920425).

Almost surely, 2^7840849 is an apocalyptic number.

It is an amenable number.

7840849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7840849 is an equidigital number, since it uses as much as digits as its factorization.

7840849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 7840849 is about 2800.1516030387. The cubic root of 7840849 is about 198.6648483510.

The spelling of 7840849 in words is "seven million, eight hundred forty thousand, eight hundred forty-nine".