442666646 has 4 divisors (see below), whose sum is σ = 663999972. Its totient is φ = 221333322.

The previous prime is 442666613. The next prime is 442666649. The reversal of 442666646 is 646666244.

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

It is a junction number, because it is equal to n+sod(n) for n = 442666597 and 442666606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442666649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110666660 + ... + 110666663.

It is an arithmetic number, because the mean of its divisors is an integer number (165999993).

Almost surely, 2^442666646 is an apocalyptic number.

442666646 is a deficient number, since it is larger than the sum of its proper divisors (221333326).

442666646 is a wasteful number, since it uses less digits than its factorization.

442666646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221333325.

The product of its digits is 995328, while the sum is 44.

The square root of 442666646 is about 21039.6446262764. The cubic root of 442666646 is about 762.1239330161.

The spelling of 442666646 in words is "four hundred forty-two million, six hundred sixty-six thousand, six hundred forty-six".