440004420 has 48 divisors (see below), whose sum is σ = 1368904320. Its totient is φ = 117334368.

The previous prime is 440004403. The next prime is 440004427. The reversal of 440004420 is 24400044.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 440004393 and 440004402.

It is not an unprimeable number, because it can be changed into a prime (440004427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406872 + ... + 407951.

It is an arithmetic number, because the mean of its divisors is an integer number (28518840).

Almost surely, 2^440004420 is an apocalyptic number.

It is an amenable number.

440004420 is an abundant number, since it is smaller than the sum of its proper divisors (928899900).

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

440004420 is a wasteful number, since it uses less digits than its factorization.

440004420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814841 (or 814833 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 440004420 is about 20976.2823207546. The cubic root of 440004420 is about 760.5930389695.

Adding to 440004420 its reverse (24400044), we get a palindrome (464404464).

The spelling of 440004420 in words is "four hundred forty million, four thousand, four hundred twenty".