440813 has 8 divisors (see below), whose sum is σ = 459648. Its totient is φ = 422464.

The previous prime is 440809. The next prime is 440821. The reversal of 440813 is 318044.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 440813 - 2² = 440809 is a prime.

It is a super-2 number, since 2×440813² = 388632201938, 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 (440863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3845 + ... + 3957.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2⁴⁴⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

440813 is a deficient number, since it is larger than the sum of its proper divisors (18835).

440813 is a wasteful number, since it uses less digits than its factorization.

440813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 440813 is about 663.9374970583. The cubic root of 440813 is about 76.1058658521.

Adding to 440813 its reverse (318044), we get a palindrome (758857).

The spelling of 440813 in words is "four hundred forty thousand, eight hundred thirteen".