442549644 has 24 divisors (see below), whose sum is σ = 1093358448. Its totient is φ = 138839040.

The previous prime is 442549643. The next prime is 442549649. The reversal of 442549644 is 446945244.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 442549596 and 442549605.

It is not an unprimeable number, because it can be changed into a prime (442549643) 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, 1084477 + ... + 1084884.

It is an arithmetic number, because the mean of its divisors is an integer number (45556602).

Almost surely, 2^442549644 is an apocalyptic number.

It is an amenable number.

442549644 is an abundant number, since it is smaller than the sum of its proper divisors (650808804).

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

442549644 is a wasteful number, since it uses less digits than its factorization.

442549644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169385 (or 2169383 counting only the distinct ones).

The product of its digits is 552960, while the sum is 42.

The square root of 442549644 is about 21036.8639297781. The cubic root of 442549644 is about 762.0567809935.

The spelling of 442549644 in words is "four hundred forty-two million, five hundred forty-nine thousand, six hundred forty-four".