445957621 has 4 divisors (see below), whose sum is σ = 461335500. Its totient is φ = 430579744.

The previous prime is 445957619. The next prime is 445957637. The reversal of 445957621 is 126759544.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 375816996 + 70140625 = 19386^2 + 8375^2 .

It is a cyclic number.

It is not a de Polignac number, because 445957621 - 2¹ = 445957619 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 (445957021) 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, 7688896 + ... + 7688953.

It is an arithmetic number, because the mean of its divisors is an integer number (115333875).

Almost surely, 2^445957621 is an apocalyptic number.

It is an amenable number.

445957621 is a deficient number, since it is larger than the sum of its proper divisors (15377879).

445957621 is a wasteful number, since it uses less digits than its factorization.

445957621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15377878.

The product of its digits is 302400, while the sum is 43.

The square root of 445957621 is about 21117.7087062020. The cubic root of 445957621 is about 764.0079247051.

The spelling of 445957621 in words is "four hundred forty-five million, nine hundred fifty-seven thousand, six hundred twenty-one".