445621 has 8 divisors (see below), whose sum is σ = 514944. Its totient is φ = 381120.

The previous prime is 445619. The next prime is 445631. The reversal of 445621 is 126544.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 445621 - 2¹ = 445619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 445592 and 445601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005 + ... + 1378.

It is an arithmetic number, because the mean of its divisors is an integer number (64368).

2⁴⁴⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

445621 is a deficient number, since it is larger than the sum of its proper divisors (69323).

445621 is a wasteful number, since it uses less digits than its factorization.

445621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411.

The product of its digits is 960, while the sum is 22.

The square root of 445621 is about 667.5485001107. The cubic root of 445621 is about 76.3815644964.

It can be divided in two parts, 44 and 5621, that added together give a palindrome (5665).

The spelling of 445621 in words is "four hundred forty-five thousand, six hundred twenty-one".