4021440423 has 128 divisors (see below), whose sum is σ = 7832401920. Its totient is φ = 1765048320.

The previous prime is 4021440419. The next prime is 4021440431. The reversal of 4021440423 is 3240441204.

It is a happy number.

It is not a de Polignac number, because 4021440423 - 2² = 4021440419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4021440393 and 4021440402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021440403) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1887823 + ... + 1889951.

It is an arithmetic number, because the mean of its divisors is an integer number (61190640).

Almost surely, 2^4021440423 is an apocalyptic number.

4021440423 is a deficient number, since it is larger than the sum of its proper divisors (3810961497).

4021440423 is a wasteful number, since it uses less digits than its factorization.

4021440423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 4021440423 is about 63414.8281003741. The cubic root of 4021440423 is about 1590.2322120403.

Adding to 4021440423 its reverse (3240441204), we get a palindrome (7261881627).

It can be divided in two parts, 4021 and 440423, that added together give a palindrome (444444).

The spelling of 4021440423 in words is "four billion, twenty-one million, four hundred forty thousand, four hundred twenty-three".