7897849 has 2 divisors, whose sum is σ = 7897850. Its totient is φ = 7897848.

The previous prime is 7897847. The next prime is 7897861. The reversal of 7897849 is 9487987.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5198400 + 2699449 = 2280^2 + 1643^2 .

It is a cyclic number.

It is not a de Polignac number, because 7897849 - 2¹ = 7897847 is a prime.

Together with 7897847, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 7897796 and 7897805.

It is not a weakly prime, because it can be changed into another prime (7897847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3948924 + 3948925.

It is an arithmetic number, because the mean of its divisors is an integer number (3948925).

Almost surely, 2^7897849 is an apocalyptic number.

It is an amenable number.

7897849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7897849 is an equidigital number, since it uses as much as digits as its factorization.

7897849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 52.

The square root of 7897849 is about 2810.3111927329. The cubic root of 7897849 is about 199.1450925397.

The spelling of 7897849 in words is "seven million, eight hundred ninety-seven thousand, eight hundred forty-nine".