444640161 has 64 divisors (see below), whose sum is σ = 729907200. Its totient is φ = 240327360.

The previous prime is 444640139. The next prime is 444640181. The reversal of 444640161 is 161046444.

It is not a de Polignac number, because 444640161 - 2⁵ = 444640129 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (444640181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1690516 + ... + 1690778.

It is an arithmetic number, because the mean of its divisors is an integer number (11404800).

Almost surely, 2^444640161 is an apocalyptic number.

It is an amenable number.

444640161 is a deficient number, since it is larger than the sum of its proper divisors (285267039).

444640161 is a wasteful number, since it uses less digits than its factorization.

444640161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 444640161 is about 21086.4923825657. The cubic root of 444640161 is about 763.2548316941.

The spelling of 444640161 in words is "four hundred forty-four million, six hundred forty thousand, one hundred sixty-one".