5643949 has 4 divisors (see below), whose sum is σ = 5975964. Its totient is φ = 5311936.

The previous prime is 5643923. The next prime is 5643961. The reversal of 5643949 is 9493465.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9493465 = 5 ⋅1898693.

It can be written as a sum of positive squares in 2 ways, for example, as 1841449 + 3802500 = 1357^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 5643949 - 2⁷ = 5643821 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5643919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165982 + ... + 166015.

It is an arithmetic number, because the mean of its divisors is an integer number (1493991).

Almost surely, 2^5643949 is an apocalyptic number.

It is an amenable number.

5643949 is a deficient number, since it is larger than the sum of its proper divisors (332015).

5643949 is a wasteful number, since it uses less digits than its factorization.

5643949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332014.

The product of its digits is 116640, while the sum is 40.

The square root of 5643949 is about 2375.6996864082. The cubic root of 5643949 is about 178.0441438299.

The spelling of 5643949 in words is "five million, six hundred forty-three thousand, nine hundred forty-nine".