444640 has 48 divisors (see below), whose sum is σ = 1203552. Its totient is φ = 152064.

The previous prime is 444637. The next prime is 444641. The reversal of 444640 is 46444.

444640 = T₂₄₅ + T₂₄₆ + ... + T₂₅₈.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922 + ... + 1318.

It is an arithmetic number, because the mean of its divisors is an integer number (25074).

2⁴⁴⁴⁶⁴⁰ is an apocalyptic number.

444640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 444640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (601776).

444640 is an abundant number, since it is smaller than the sum of its proper divisors (758912).

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

444640 is a wasteful number, since it uses less digits than its factorization.

444640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 444640 is about 666.8133172035. The cubic root of 444640 is about 76.3254739572.

It can be divided in two parts, 4 and 44640, that added together give a palindrome (44644).

The spelling of 444640 in words is "four hundred forty-four thousand, six hundred forty".