7878841 has 2 divisors, whose sum is σ = 7878842. Its totient is φ = 7878840.

The previous prime is 7878823. The next prime is 7878853. The reversal of 7878841 is 1488787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 10816 = 2805^2 + 104^2 .

It is an emirp because it is prime and its reverse (1488787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7878841 - 2⁵ = 7878809 is a prime.

It is a super-2 number, since 2×7878841² = 124152271006562, which contains 22 as substring.

It is a d-powerful number, because it can be written as 7⁵ + 8 + 7⁸ + 8 + 8⁷ + 4³ + 1 .

It is not a weakly prime, because it can be changed into another prime (7878341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3939420 + 3939421.

It is an arithmetic number, because the mean of its divisors is an integer number (3939421).

Almost surely, 2^7878841 is an apocalyptic number.

It is an amenable number.

7878841 is a deficient number, since it is larger than the sum of its proper divisors (1).

7878841 is an equidigital number, since it uses as much as digits as its factorization.

7878841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 43.

The square root of 7878841 is about 2806.9273236049. The cubic root of 7878841 is about 198.9852012934.

The spelling of 7878841 in words is "seven million, eight hundred seventy-eight thousand, eight hundred forty-one".