2678391 has 12 divisors (see below), whose sum is σ = 3898440. Its totient is φ = 1771920.

The previous prime is 2678387. The next prime is 2678399. The reversal of 2678391 is 1938762.

2678391 is a `hidden beast` number, since 267 + 8 + 391 = 666.

It is not a de Polignac number, because 2678391 - 2² = 2678387 is a prime.

2678391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181 + ... + 2321.

It is an arithmetic number, because the mean of its divisors is an integer number (324870).

2^2678391 is an apocalyptic number.

2678391 is a deficient number, since it is larger than the sum of its proper divisors (1220049).

2678391 is a wasteful number, since it uses less digits than its factorization.

2678391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286 (or 2283 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 2678391 is about 1636.5790540026. The cubic root of 2678391 is about 138.8751877210.

The spelling of 2678391 in words is "two million, six hundred seventy-eight thousand, three hundred ninety-one".