45444 has 24 divisors (see below), whose sum is σ = 121408. Its totient is φ = 12960.

The previous prime is 45439. The next prime is 45481. The reversal of 45444 is 44454.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 45444.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187 + ... + 354.

2⁴⁵⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

45444 is an abundant number, since it is smaller than the sum of its proper divisors (75964).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60704).

45444 is a wasteful number, since it uses less digits than its factorization.

45444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 553 counting only the distinct ones).

The product of its digits is 1280, while the sum is 21.

The square root of 45444 is about 213.1759836379. The cubic root of 45444 is about 35.6855326671.

Adding to 45444 its reverse (44454), we get a palindrome (89898).

Subtracting from 45444 its reverse (44454), we obtain a triangular number (990 = T₄₄).

The spelling of 45444 in words is "forty-five thousand, four hundred forty-four".