7878491 has 2 divisors, whose sum is σ = 7878492. Its totient is φ = 7878490.

The previous prime is 7878487. The next prime is 7878511. The reversal of 7878491 is 1948787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7878491 - 2² = 7878487 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7878421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3939245 + 3939246.

It is an arithmetic number, because the mean of its divisors is an integer number (3939246).

Almost surely, 2^7878491 is an apocalyptic number.

7878491 is a deficient number, since it is larger than the sum of its proper divisors (1).

7878491 is an equidigital number, since it uses as much as digits as its factorization.

7878491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 7878491 is about 2806.8649771587. The cubic root of 7878491 is about 198.9822547580.

The spelling of 7878491 in words is "seven million, eight hundred seventy-eight thousand, four hundred ninety-one".