7897819 has 2 divisors, whose sum is σ = 7897820. Its totient is φ = 7897818.

The previous prime is 7897817. The next prime is 7897847. The reversal of 7897819 is 9187987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7897819 - 2¹ = 7897817 is a prime.

It is a super-4 number, since 4×7897819⁴ (a number of 29 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 7897817, it forms a pair of twin primes.

7897819 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7897817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3948909 + 3948910.

It is an arithmetic number, because the mean of its divisors is an integer number (3948910).

Almost surely, 2^7897819 is an apocalyptic number.

7897819 is a deficient number, since it is larger than the sum of its proper divisors (1).

7897819 is an equidigital number, since it uses as much as digits as its factorization.

7897819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 49.

The square root of 7897819 is about 2810.3058552407. The cubic root of 7897819 is about 199.1448403883.

The spelling of 7897819 in words is "seven million, eight hundred ninety-seven thousand, eight hundred nineteen".