2638191 has 8 divisors (see below), whose sum is σ = 3525120. Its totient is φ = 1755032.

The previous prime is 2638187. The next prime is 2638199. The reversal of 2638191 is 1918362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2638191 - 2² = 2638187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2080 + ... + 3098.

It is an arithmetic number, because the mean of its divisors is an integer number (440640).

2^2638191 is an apocalyptic number.

2638191 is a deficient number, since it is larger than the sum of its proper divisors (886929).

2638191 is a wasteful number, since it uses less digits than its factorization.

2638191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885.

The product of its digits is 2592, while the sum is 30.

The square root of 2638191 is about 1624.2509042633. The cubic root of 2638191 is about 138.1768893173.

The spelling of 2638191 in words is "two million, six hundred thirty-eight thousand, one hundred ninety-one".