5640491 has 4 divisors (see below), whose sum is σ = 5717832. Its totient is φ = 5563152.

The previous prime is 5640463. The next prime is 5640527. The reversal of 5640491 is 1940465.

5640491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 5640491 - 2¹⁰ = 5639467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5640461) 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, 38561 + ... + 38706.

It is an arithmetic number, because the mean of its divisors is an integer number (1429458).

Almost surely, 2^5640491 is an apocalyptic number.

5640491 is a deficient number, since it is larger than the sum of its proper divisors (77341).

5640491 is an equidigital number, since it uses as much as digits as its factorization.

5640491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77340.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 5640491 is about 2374.9717893061. The cubic root of 5640491 is about 178.0077743522.

The spelling of 5640491 in words is "five million, six hundred forty thousand, four hundred ninety-one".