2878391 has 2 divisors, whose sum is σ = 2878392. Its totient is φ = 2878390.

The previous prime is 2878373. The next prime is 2878397. The reversal of 2878391 is 1938782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2878391 - 2¹⁰ = 2877367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2878397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1439195 + 1439196.

It is an arithmetic number, because the mean of its divisors is an integer number (1439196).

2^2878391 is an apocalyptic number.

2878391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2878391 is an equidigital number, since it uses as much as digits as its factorization.

2878391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 2878391 is about 1696.5821524465. The cubic root of 2878391 is about 142.2492316822.

The spelling of 2878391 in words is "two million, eight hundred seventy-eight thousand, three hundred ninety-one".