445059821 has 4 divisors (see below), whose sum is σ = 464410272. Its totient is φ = 425709372.

The previous prime is 445059787. The next prime is 445059827. The reversal of 445059821 is 128950544.

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 a de Polignac number, because none of the positive numbers 2^k-445059821 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 (445059827) 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, 9675191 + ... + 9675236.

It is an arithmetic number, because the mean of its divisors is an integer number (116102568).

Almost surely, 2^445059821 is an apocalyptic number.

It is an amenable number.

445059821 is a deficient number, since it is larger than the sum of its proper divisors (19350451).

445059821 is a wasteful number, since it uses less digits than its factorization.

445059821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19350450.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 445059821 is about 21096.4409557631. The cubic root of 445059821 is about 763.4948810889.

The spelling of 445059821 in words is "four hundred forty-five million, fifty-nine thousand, eight hundred twenty-one".