440021430 has 64 divisors (see below), whose sum is σ = 1202040000. Its totient is φ = 114474240.

The previous prime is 440021411. The next prime is 440021431. The reversal of 440021430 is 34120044.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440021431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8805 + ... + 30944.

It is an arithmetic number, because the mean of its divisors is an integer number (18781875).

Almost surely, 2^440021430 is an apocalyptic number.

440021430 is an abundant number, since it is smaller than the sum of its proper divisors (762018570).

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

440021430 is a wasteful number, since it uses less digits than its factorization.

440021430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39806 (or 39800 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 440021430 is about 20976.6877747656. The cubic root of 440021430 is about 760.6028400232.

Adding to 440021430 its reverse (34120044), we get a palindrome (474141474).

The spelling of 440021430 in words is "four hundred forty million, twenty-one thousand, four hundred thirty".