445381 has 4 divisors (see below), whose sum is σ = 447372. Its totient is φ = 443392.

The previous prime is 445363. The next prime is 445427. The reversal of 445381 is 183544.

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 349281 + 96100 = 591^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 445381 - 2⁹ = 444869 is a prime.

It is a super-2 number, since 2×445381² = 396728470322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445321) 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 3 ways as a sum of consecutive naturals, for example, 610 + ... + 1123.

It is an arithmetic number, because the mean of its divisors is an integer number (111843).

2⁴⁴⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

445381 is a deficient number, since it is larger than the sum of its proper divisors (1991).

445381 is a wasteful number, since it uses less digits than its factorization.

445381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990.

The product of its digits is 1920, while the sum is 25.

The square root of 445381 is about 667.3687136808. The cubic root of 445381 is about 76.3678496524.

The spelling of 445381 in words is "four hundred forty-five thousand, three hundred eighty-one".