7878823 has 2 divisors, whose sum is σ = 7878824. Its totient is φ = 7878822.

The previous prime is 7878809. The next prime is 7878841. The reversal of 7878823 is 3288787.

It is a weak prime.

It is an emirp because it is prime and its reverse (3288787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7878823 - 2⁵ = 7878791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7878823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7878853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3939411 + 3939412.

It is an arithmetic number, because the mean of its divisors is an integer number (3939412).

Almost surely, 2^7878823 is an apocalyptic number.

7878823 is a deficient number, since it is larger than the sum of its proper divisors (1).

7878823 is an equidigital number, since it uses as much as digits as its factorization.

7878823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 7878823 is about 2806.9241172501. The cubic root of 7878823 is about 198.9850497594.

The spelling of 7878823 in words is "seven million, eight hundred seventy-eight thousand, eight hundred twenty-three".