5491638 has 40 divisors (see below), whose sum is σ = 12458160. Its totient is φ = 1807920.

The previous prime is 5491631. The next prime is 5491639. The reversal of 5491638 is 8361945.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5491631) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17503 + ... + 17813.

It is an arithmetic number, because the mean of its divisors is an integer number (311454).

Almost surely, 2^5491638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5491638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6229080).

5491638 is an abundant number, since it is smaller than the sum of its proper divisors (6966522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5491638 is a wasteful number, since it uses less digits than its factorization.

5491638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 425 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 5491638 is about 2343.4244173858. The cubic root of 5491638 is about 176.4279145051.

It can be divided in two parts, 549 and 1638, that added together give a 7-th power (2187 = 3⁷).

The spelling of 5491638 in words is "five million, four hundred ninety-one thousand, six hundred thirty-eight".