56393821 has 4 divisors (see below), whose sum is σ = 61520544. Its totient is φ = 51267100.

The previous prime is 56393807. The next prime is 56393851. The reversal of 56393821 is 12839365.

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 56393821 - 2¹¹ = 56391773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56393851) 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, 2563345 + ... + 2563366.

It is an arithmetic number, because the mean of its divisors is an integer number (15380136).

Almost surely, 2^56393821 is an apocalyptic number.

It is an amenable number.

56393821 is a deficient number, since it is larger than the sum of its proper divisors (5126723).

56393821 is a wasteful number, since it uses less digits than its factorization.

56393821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126722.

The product of its digits is 38880, while the sum is 37.

The square root of 56393821 is about 7509.5819457544. The cubic root of 56393821 is about 383.4809905432.

The spelling of 56393821 in words is "fifty-six million, three hundred ninety-three thousand, eight hundred twenty-one".