4423440 has 80 divisors (see below), whose sum is σ = 15677568. Its totient is φ = 1010688.

The previous prime is 4423427. The next prime is 4423481. The reversal of 4423440 is 443244.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364 + ... + 2996.

Almost surely, 2^4423440 is an apocalyptic number.

4423440 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 4423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7838784).

4423440 is an abundant number, since it is smaller than the sum of its proper divisors (11254128).

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

4423440 is a wasteful number, since it uses less digits than its factorization.

4423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656 (or 2650 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 4423440 is about 2103.1975656129. The cubic root of 4423440 is about 164.1547221190.

Adding to 4423440 its reverse (443244), we get a palindrome (4866684).

The spelling of 4423440 in words is "four million, four hundred twenty-three thousand, four hundred forty".