456805821 has 4 divisors (see below), whose sum is σ = 609074432. Its totient is φ = 304537212.

The previous prime is 456805807. The next prime is 456805823. The reversal of 456805821 is 128508654.

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 not a de Polignac number, because 456805821 - 2¹⁹ = 456281533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 456805821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (456805823) 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, 76134301 + ... + 76134306.

It is an arithmetic number, because the mean of its divisors is an integer number (152268608).

Almost surely, 2^456805821 is an apocalyptic number.

It is an amenable number.

456805821 is a deficient number, since it is larger than the sum of its proper divisors (152268611).

456805821 is a wasteful number, since it uses less digits than its factorization.

456805821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152268610.

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 456805821 is about 21373.0161886431. The cubic root of 456805821 is about 770.1533517022.

The spelling of 456805821 in words is "four hundred fifty-six million, eight hundred five thousand, eight hundred twenty-one".