2604391 has 2 divisors, whose sum is σ = 2604392. Its totient is φ = 2604390.

The previous prime is 2604377. The next prime is 2604401. The reversal of 2604391 is 1934062.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2604391 - 2⁷ = 2604263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2604191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302195 + 1302196.

It is an arithmetic number, because the mean of its divisors is an integer number (1302196).

2^2604391 is an apocalyptic number.

2604391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2604391 is an equidigital number, since it uses as much as digits as its factorization.

2604391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 2604391 is about 1613.8125665640. The cubic root of 2604391 is about 137.5842524964.

The spelling of 2604391 in words is "two million, six hundred four thousand, three hundred ninety-one".