442991508 has 24 divisors (see below), whose sum is σ = 1094450112. Its totient is φ = 138977664.

The previous prime is 442991467. The next prime is 442991509. The reversal of 442991508 is 805199244.

It is a super-2 number, since 2×442991508² = 392482952320228128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 442991508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442991509) 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, 1085560 + ... + 1085967.

It is an arithmetic number, because the mean of its divisors is an integer number (45602088).

Almost surely, 2^442991508 is an apocalyptic number.

It is an amenable number.

442991508 is an abundant number, since it is smaller than the sum of its proper divisors (651458604).

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

442991508 is a wasteful number, since it uses less digits than its factorization.

442991508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171551 (or 2171549 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 442991508 is about 21047.3634453344. The cubic root of 442991508 is about 762.3103220039.

The spelling of 442991508 in words is "four hundred forty-two million, nine hundred ninety-one thousand, five hundred eight".