5643905 has 4 divisors (see below), whose sum is σ = 6772692. Its totient is φ = 4515120.

The previous prime is 5643877. The next prime is 5643919. The reversal of 5643905 is 5093465.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1607824 + 4036081 = 1268^2 + 2009^2 .

It is not a de Polignac number, because 5643905 - 2¹⁶ = 5578369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564386 + ... + 564395.

It is an arithmetic number, because the mean of its divisors is an integer number (1693173).

Almost surely, 2^5643905 is an apocalyptic number.

It is an amenable number.

5643905 is a deficient number, since it is larger than the sum of its proper divisors (1128787).

5643905 is a wasteful number, since it uses less digits than its factorization.

5643905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128786.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 5643905 is about 2375.6904259604. The cubic root of 5643905 is about 178.0436811537.

The spelling of 5643905 in words is "five million, six hundred forty-three thousand, nine hundred five".