5726821 has 4 divisors (see below), whose sum is σ = 5739552. Its totient is φ = 5714092.

The previous prime is 5726813. The next prime is 5726827. The reversal of 5726821 is 1286275.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5726821 - 2³ = 5726813 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam 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 (5726827) 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, 5665 + ... + 6598.

It is an arithmetic number, because the mean of its divisors is an integer number (1434888).

Almost surely, 2^5726821 is an apocalyptic number.

It is an amenable number.

5726821 is a deficient number, since it is larger than the sum of its proper divisors (12731).

5726821 is a wasteful number, since it uses less digits than its factorization.

5726821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12730.

The product of its digits is 6720, while the sum is 31.

The square root of 5726821 is about 2393.0777254406. The cubic root of 5726821 is about 178.9113404659.

The spelling of 5726821 in words is "five million, seven hundred twenty-six thousand, eight hundred twenty-one".