440535661 has 4 divisors (see below), whose sum is σ = 441500092. Its totient is φ = 439571232.

The previous prime is 440535649. The next prime is 440535701. The reversal of 440535661 is 166535044.

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 225180036 + 215355625 = 15006^2 + 14675^2 .

It is a cyclic number.

It is not a de Polignac number, because 440535661 - 2⁷ = 440535533 is a prime.

It is a super-2 number, since 2×440535661² = 388143337225413842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440535631) 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, 481530 + ... + 482443.

It is an arithmetic number, because the mean of its divisors is an integer number (110375023).

Almost surely, 2^440535661 is an apocalyptic number.

It is an amenable number.

440535661 is a deficient number, since it is larger than the sum of its proper divisors (964431).

440535661 is an equidigital number, since it uses as much as digits as its factorization.

440535661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964430.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 440535661 is about 20988.9413977933. The cubic root of 440535661 is about 760.8990174881.

The spelling of 440535661 in words is "four hundred forty million, five hundred thirty-five thousand, six hundred sixty-one".