440123421 has 32 divisors (see below), whose sum is σ = 638254080. Its totient is φ = 268741376.

The previous prime is 440123417. The next prime is 440123449. The reversal of 440123421 is 124321044.

It is a cyclic number.

It is not a de Polignac number, because 440123421 - 2² = 440123417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440123221) 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, 321280 + ... + 322646.

It is an arithmetic number, because the mean of its divisors is an integer number (19945440).

Almost surely, 2^440123421 is an apocalyptic number.

It is an amenable number.

440123421 is a deficient number, since it is larger than the sum of its proper divisors (198130659).

440123421 is a wasteful number, since it uses less digits than its factorization.

440123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 440123421 is about 20979.1186897829. The cubic root of 440123421 is about 760.6616012912.

Adding to 440123421 its reverse (124321044), we get a palindrome (564444465).

The spelling of 440123421 in words is "four hundred forty million, one hundred twenty-three thousand, four hundred twenty-one".