442478997 has 8 divisors (see below), whose sum is σ = 655524480. Its totient is φ = 294985980.

The previous prime is 442478989. The next prime is 442479001. The reversal of 442478997 is 799874244.

It is a happy number.

It is not a de Polignac number, because 442478997 - 2³ = 442478989 is a prime.

It is a super-2 number, since 2×442478997² = 391575325572252018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442478957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8194029 + ... + 8194082.

It is an arithmetic number, because the mean of its divisors is an integer number (81940560).

Almost surely, 2^442478997 is an apocalyptic number.

It is an amenable number.

442478997 is a deficient number, since it is larger than the sum of its proper divisors (213045483).

442478997 is a wasteful number, since it uses less digits than its factorization.

442478997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16388120 (or 16388114 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 442478997 is about 21035.1847389083. The cubic root of 442478997 is about 762.0162281868.

The spelling of 442478997 in words is "four hundred forty-two million, four hundred seventy-eight thousand, nine hundred ninety-seven".