445443021 has 6 divisors (see below), whose sum is σ = 643417710. Its totient is φ = 296962008.

The previous prime is 445442957. The next prime is 445443023. The reversal of 445443021 is 120344544.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 424154025 + 21288996 = 20595^2 + 4614^2 .

It is not a de Polignac number, because 445443021 - 2⁶ = 445442957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445443023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24746826 + ... + 24746843.

It is an arithmetic number, because the mean of its divisors is an integer number (107236285).

Almost surely, 2^445443021 is an apocalyptic number.

It is an amenable number.

445443021 is a deficient number, since it is larger than the sum of its proper divisors (197974689).

445443021 is a wasteful number, since it uses less digits than its factorization.

445443021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49493675 (or 49493672 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 445443021 is about 21105.5211023088. The cubic root of 445443021 is about 763.7139432585.

Adding to 445443021 its reverse (120344544), we get a palindrome (565787565).

The spelling of 445443021 in words is "four hundred forty-five million, four hundred forty-three thousand, twenty-one".