442791686 has 4 divisors (see below), whose sum is σ = 664187532. Its totient is φ = 221395842.

The previous prime is 442791641. The next prime is 442791689. The reversal of 442791686 is 686197244.

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

It is a self number, because there is not a number n which added to its sum of digits gives 442791686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442791689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110697920 + ... + 110697923.

It is an arithmetic number, because the mean of its divisors is an integer number (166046883).

Almost surely, 2^442791686 is an apocalyptic number.

442791686 is a deficient number, since it is larger than the sum of its proper divisors (221395846).

442791686 is a wasteful number, since it uses less digits than its factorization.

442791686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221395845.

The product of its digits is 580608, while the sum is 47.

The square root of 442791686 is about 21042.6159495439. The cubic root of 442791686 is about 762.1956852824.

The spelling of 442791686 in words is "four hundred forty-two million, seven hundred ninety-one thousand, six hundred eighty-six".