440442521 has 4 divisors (see below), whose sum is σ = 442656000. Its totient is φ = 438229044.

The previous prime is 440442481. The next prime is 440442529. The reversal of 440442521 is 125244044.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-440442521 is a prime.

It is a super-2 number, since 2×440442521² = 387979228609670882, 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 (440442529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1106441 + ... + 1106838.

It is an arithmetic number, because the mean of its divisors is an integer number (110664000).

Almost surely, 2^440442521 is an apocalyptic number.

It is an amenable number.

440442521 is a deficient number, since it is larger than the sum of its proper divisors (2213479).

440442521 is a wasteful number, since it uses less digits than its factorization.

440442521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213478.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 440442521 is about 20986.7224930431. The cubic root of 440442521 is about 760.8453894954.

Adding to 440442521 its reverse (125244044), we get a palindrome (565686565).

The spelling of 440442521 in words is "four hundred forty million, four hundred forty-two thousand, five hundred twenty-one".