5640423 has 16 divisors (see below), whose sum is σ = 7772160. Its totient is φ = 3636576.

The previous prime is 5640409. The next prime is 5640449. The reversal of 5640423 is 3240465.

It is not a de Polignac number, because 5640423 - 2¹⁰ = 5639399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5640393 and 5640402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5640403) 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, 15186 + ... + 15552.

It is an arithmetic number, because the mean of its divisors is an integer number (485760).

Almost surely, 2^5640423 is an apocalyptic number.

5640423 is a deficient number, since it is larger than the sum of its proper divisors (2131737).

5640423 is a wasteful number, since it uses less digits than its factorization.

5640423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 5640423 is about 2374.9574733035. The cubic root of 5640423 is about 178.0070590139.

Adding to 5640423 its reverse (3240465), we get a palindrome (8880888).

The spelling of 5640423 in words is "five million, six hundred forty thousand, four hundred twenty-three".