442278738 has 64 divisors (see below), whose sum is σ = 1087395840. Its totient is φ = 132123600.

The previous prime is 442278719. The next prime is 442278743. The reversal of 442278738 is 837872244.

It is a super-2 number, since 2×442278738² = 391220964173745288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 442278693 and 442278702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36931 + ... + 47417.

It is an arithmetic number, because the mean of its divisors is an integer number (16990560).

Almost surely, 2^442278738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 442278738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543697920).

442278738 is an abundant number, since it is smaller than the sum of its proper divisors (645117102).

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

442278738 is a wasteful number, since it uses less digits than its factorization.

442278738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580 (or 10574 counting only the distinct ones).

The product of its digits is 602112, while the sum is 45.

The square root of 442278738 is about 21030.4241041402. The cubic root of 442278738 is about 761.9012520063.

The spelling of 442278738 in words is "four hundred forty-two million, two hundred seventy-eight thousand, seven hundred thirty-eight".