445890 has 32 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 116864.

The previous prime is 445883. The next prime is 445891. The reversal of 445890 is 98544.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (445891) by changing a digit.

445890 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2587 + ... + 2753.

It is an arithmetic number, because the mean of its divisors is an integer number (34020).

2⁴⁴⁵⁸⁹⁰ is an apocalyptic number.

445890 is an abundant number, since it is smaller than the sum of its proper divisors (642750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

445890 is a wasteful number, since it uses less digits than its factorization.

445890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 445890 is about 667.7499532010. The cubic root of 445890 is about 76.3969306991.

The spelling of 445890 in words is "four hundred forty-five thousand, eight hundred ninety".