440421421 has 8 divisors (see below), whose sum is σ = 481507488. Its totient is φ = 399510000.

The previous prime is 440421383. The next prime is 440421439. The reversal of 440421421 is 124124044.

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 440421421 - 2²¹ = 438324269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 440421392 and 440421401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440421451) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 38355 + ... + 48496.

It is an arithmetic number, because the mean of its divisors is an integer number (60188436).

Almost surely, 2^440421421 is an apocalyptic number.

It is an amenable number.

440421421 is a deficient number, since it is larger than the sum of its proper divisors (41086067).

440421421 is a wasteful number, since it uses less digits than its factorization.

440421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87323.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 440421421 is about 20986.2197882325. The cubic root of 440421421 is about 760.8332395225.

Adding to 440421421 its reverse (124124044), we get a palindrome (564545465).

The spelling of 440421421 in words is "four hundred forty million, four hundred twenty-one thousand, four hundred twenty-one".