445881 has 4 divisors (see below), whose sum is σ = 594512. Its totient is φ = 297252.

The previous prime is 445877. The next prime is 445883. The reversal of 445881 is 188544.

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 not a de Polignac number, because 445881 - 2² = 445877 is a prime.

It is a super-2 number, since 2×445881² = 397619732322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

445881 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 445881.

It is not an unprimeable number, because it can be changed into a prime (445883) 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, 74311 + ... + 74316.

It is an arithmetic number, because the mean of its divisors is an integer number (148628).

2⁴⁴⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

445881 is a deficient number, since it is larger than the sum of its proper divisors (148631).

445881 is a wasteful number, since it uses less digits than its factorization.

445881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148630.

The product of its digits is 5120, while the sum is 30.

The square root of 445881 is about 667.7432141175. The cubic root of 445881 is about 76.3964166882.

It can be divided in two parts, 445 and 881, that added together give a triangular number (1326 = T₅₁).

The spelling of 445881 in words is "four hundred forty-five thousand, eight hundred eighty-one".