5640621 has 16 divisors (see below), whose sum is σ = 8674944. Its totient is φ = 3193344.

The previous prime is 5640619. The next prime is 5640623. The reversal of 5640621 is 1260465.

It is an interprime number because it is at equal distance from previous prime (5640619) and next prime (5640623).

It is not a de Polignac number, because 5640621 - 2¹ = 5640619 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5640591 and 5640600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5640623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1185 + ... + 3561.

It is an arithmetic number, because the mean of its divisors is an integer number (542184).

Almost surely, 2^5640621 is an apocalyptic number.

It is an amenable number.

5640621 is a deficient number, since it is larger than the sum of its proper divisors (3034323).

5640621 is a wasteful number, since it uses less digits than its factorization.

5640621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 5640621 is about 2374.9991578946. Note that the first 3 decimals coincide. The cubic root of 5640621 is about 178.0091418947.

The spelling of 5640621 in words is "five million, six hundred forty thousand, six hundred twenty-one".