442218631 has 8 divisors (see below), whose sum is σ = 464768640. Its totient is φ = 419945592.

The previous prime is 442218617. The next prime is 442218641. The reversal of 442218631 is 136812244.

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

It is not a de Polignac number, because 442218631 - 2¹⁹ = 441694343 is a prime.

It is a super-2 number, since 2×442218631² = 391114635207028322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 442218593 and 442218602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442218611) 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, 65965 + ... + 72358.

It is an arithmetic number, because the mean of its divisors is an integer number (58096080).

Almost surely, 2^442218631 is an apocalyptic number.

442218631 is a deficient number, since it is larger than the sum of its proper divisors (22550009).

442218631 is a wasteful number, since it uses less digits than its factorization.

442218631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138485.

The product of its digits is 9216, while the sum is 31.

The square root of 442218631 is about 21028.9950068946. The cubic root of 442218631 is about 761.8667355582.

The spelling of 442218631 in words is "four hundred forty-two million, two hundred eighteen thousand, six hundred thirty-one".