2634391 has 4 divisors (see below), whose sum is σ = 2644384. Its totient is φ = 2624400.

The previous prime is 2634377. The next prime is 2634403. The reversal of 2634391 is 1934362.

It is a semiprime because it is the product of two primes.

It is a 4-Lehmer number, since φ(2634391) divides (2634391-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 2634391 - 2⁷ = 2634263 is a prime.

It is a Duffinian number.

2634391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2634301) 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, 4590 + ... + 5131.

It is an arithmetic number, because the mean of its divisors is an integer number (661096).

2^2634391 is an apocalyptic number.

2634391 is a deficient number, since it is larger than the sum of its proper divisors (9993).

2634391 is an equidigital number, since it uses as much as digits as its factorization.

2634391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9992.

The product of its digits is 3888, while the sum is 28.

The square root of 2634391 is about 1623.0807127189. The cubic root of 2634391 is about 138.1105149870.

It can be divided in two parts, 2634 and 391, that added together give a square (3025 = 55²).

The spelling of 2634391 in words is "two million, six hundred thirty-four thousand, three hundred ninety-one".