440405681 has 4 divisors (see below), whose sum is σ = 440518500. Its totient is φ = 440292864.

The previous prime is 440405653. The next prime is 440405683. The reversal of 440405681 is 186504044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146797456 + 293608225 = 12116^2 + 17135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440405681 is a prime.

It is a super-2 number, since 2×440405681² = 387914327714147522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (440405683) 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 3 ways as a sum of consecutive naturals, for example, 50336 + ... + 58433.

It is an arithmetic number, because the mean of its divisors is an integer number (110129625).

Almost surely, 2^440405681 is an apocalyptic number.

It is an amenable number.

440405681 is a deficient number, since it is larger than the sum of its proper divisors (112819).

440405681 is a wasteful number, since it uses less digits than its factorization.

440405681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112818.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 440405681 is about 20985.8447768966. The cubic root of 440405681 is about 760.8241757355.

The spelling of 440405681 in words is "four hundred forty million, four hundred five thousand, six hundred eighty-one".