2628391 has 4 divisors (see below), whose sum is σ = 2673000. Its totient is φ = 2583784.

The previous prime is 2628383. The next prime is 2628401. The reversal of 2628391 is 1938262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1938262 = 2 ⋅969131.

It is a cyclic number.

It is not a de Polignac number, because 2628391 - 2³ = 2628383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2628331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22216 + ... + 22333.

It is an arithmetic number, because the mean of its divisors is an integer number (668250).

2^2628391 is an apocalyptic number.

2628391 is a deficient number, since it is larger than the sum of its proper divisors (44609).

2628391 is an equidigital number, since it uses as much as digits as its factorization.

2628391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44608.

The product of its digits is 5184, while the sum is 31.

The square root of 2628391 is about 1621.2313221746. The cubic root of 2628391 is about 138.0055833350.

The spelling of 2628391 in words is "two million, six hundred twenty-eight thousand, three hundred ninety-one".