7861849 has 2 divisors, whose sum is σ = 7861850. Its totient is φ = 7861848.

The previous prime is 7861829. The next prime is 7861853. The reversal of 7861849 is 9481687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4862025 + 2999824 = 2205^2 + 1732^2 .

It is an emirp because it is prime and its reverse (9481687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7861849 - 2¹¹ = 7859801 is a prime.

It is not a weakly prime, because it can be changed into another prime (7861829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930924 + 3930925.

It is an arithmetic number, because the mean of its divisors is an integer number (3930925).

Almost surely, 2^7861849 is an apocalyptic number.

It is an amenable number.

7861849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7861849 is an equidigital number, since it uses as much as digits as its factorization.

7861849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 7861849 is about 2803.8988926136. The cubic root of 7861849 is about 198.8420503685.

The spelling of 7861849 in words is "seven million, eight hundred sixty-one thousand, eight hundred forty-nine".