443640065 has 16 divisors (see below), whose sum is σ = 581691456. Its totient is φ = 322132800.

The previous prime is 443640061. The next prime is 443640079. The reversal of 443640065 is 560046344.

It is not a de Polignac number, because 443640065 - 2² = 443640061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (443640061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30254 + ... + 42456.

It is an arithmetic number, because the mean of its divisors is an integer number (36355716).

Almost surely, 2^443640065 is an apocalyptic number.

It is an amenable number.

443640065 is a deficient number, since it is larger than the sum of its proper divisors (138051391).

443640065 is a wasteful number, since it uses less digits than its factorization.

443640065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12880.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 443640065 is about 21062.7648944767. The cubic root of 443640065 is about 762.6821580385.

The spelling of 443640065 in words is "four hundred forty-three million, six hundred forty thousand, sixty-five".