442421520 has 40 divisors (see below), whose sum is σ = 1371507456. Its totient is φ = 117979008.

The previous prime is 442421509. The next prime is 442421527. The reversal of 442421520 is 25124244.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×442421520² = 391473602718220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (442421527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921472 + ... + 921951.

Almost surely, 2^442421520 is an apocalyptic number.

442421520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

442421520 is an abundant number, since it is smaller than the sum of its proper divisors (929085936).

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

442421520 is a wasteful number, since it uses less digits than its factorization.

442421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843439 (or 1843433 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 442421520 is about 21033.8184835754. The cubic root of 442421520 is about 761.9832320419.

Adding to 442421520 its reverse (25124244), we get a palindrome (467545764).

The spelling of 442421520 in words is "four hundred forty-two million, four hundred twenty-one thousand, five hundred twenty".