7864819 has 2 divisors, whose sum is σ = 7864820. Its totient is φ = 7864818.

The previous prime is 7864817. The next prime is 7864823. The reversal of 7864819 is 9184687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7864819 - 2¹ = 7864817 is a prime.

It is a super-2 number, since 2×7864819² = 123710755805522, which contains 22 as substring.

Together with 7864817, it forms a pair of twin primes.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (7864811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932409 + 3932410.

It is an arithmetic number, because the mean of its divisors is an integer number (3932410).

Almost surely, 2^7864819 is an apocalyptic number.

7864819 is a deficient number, since it is larger than the sum of its proper divisors (1).

7864819 is an equidigital number, since it uses as much as digits as its factorization.

7864819 is an odious number, because the sum of its binary digits is odd.

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

The square root of 7864819 is about 2804.4284622718. The cubic root of 7864819 is about 198.8670863170.

The spelling of 7864819 in words is "seven million, eight hundred sixty-four thousand, eight hundred nineteen".