442645287 has 8 divisors (see below), whose sum is σ = 674507136. Its totient is φ = 252940152.

The previous prime is 442645283. The next prime is 442645289. The reversal of 442645287 is 782546244.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 442645287 - 2² = 442645283 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442645283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10539153 + ... + 10539194.

It is an arithmetic number, because the mean of its divisors is an integer number (84313392).

Almost surely, 2^442645287 is an apocalyptic number.

442645287 is a deficient number, since it is larger than the sum of its proper divisors (231861849).

442645287 is a wasteful number, since it uses less digits than its factorization.

442645287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21078357.

The product of its digits is 430080, while the sum is 42.

The square root of 442645287 is about 21039.1370307815. The cubic root of 442645287 is about 762.1116751338. Note that the first 3 decimals are identical.

The spelling of 442645287 in words is "four hundred forty-two million, six hundred forty-five thousand, two hundred eighty-seven".