442741644 has 18 divisors (see below), whose sum is σ = 1119152580. Its totient is φ = 147580536.

The previous prime is 442741609. The next prime is 442741679. The reversal of 442741644 is 446147244.

442741644 is a `hidden beast` number, since 4 + 4 + 2 + 7 + 4 + 1 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (442741609) and next prime (442741679).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 12298379 = 442741644 / (4 + 4 + 2 + 7 + 4 + 1 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 442741599 and 442741608.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6149154 + ... + 6149225.

Almost surely, 2^442741644 is an apocalyptic number.

It is an amenable number.

442741644 is an abundant number, since it is smaller than the sum of its proper divisors (676410936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

442741644 is a wasteful number, since it uses less digits than its factorization.

442741644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12298389 (or 12298384 counting only the distinct ones).

The product of its digits is 86016, while the sum is 36.

The square root of 442741644 is about 21041.4268527588. The cubic root of 442741644 is about 762.1669710776.

Adding to 442741644 its reverse (446147244), we get a palindrome (888888888).

The spelling of 442741644 in words is "four hundred forty-two million, seven hundred forty-one thousand, six hundred forty-four".