440121413 has 4 divisors (see below), whose sum is σ = 440170188. Its totient is φ = 440072640.

The previous prime is 440121379. The next prime is 440121419. The reversal of 440121413 is 314121044.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 283821409 + 156300004 = 16847^2 + 12502^2 .

It is a cyclic number.

It is not a de Polignac number, because 440121413 - 2⁶ = 440121349 is a prime.

It is a super-2 number, since 2×440121413² = 387413716362233138, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440121419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6458 + ... + 30363.

It is an arithmetic number, because the mean of its divisors is an integer number (110042547).

Almost surely, 2^440121413 is an apocalyptic number.

It is an amenable number.

440121413 is a deficient number, since it is larger than the sum of its proper divisors (48775).

440121413 is a wasteful number, since it uses less digits than its factorization.

440121413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48774.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 440121413 is about 20979.0708326179. The cubic root of 440121413 is about 760.6604444862.

Adding to 440121413 its reverse (314121044), we get a palindrome (754242457).

The spelling of 440121413 in words is "four hundred forty million, one hundred twenty-one thousand, four hundred thirteen".