42243840 has 216 divisors, whose sum is σ = 154649040. Its totient is φ = 10616832.

The previous prime is 42243829. The next prime is 42243857. The reversal of 42243840 is 4834224.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218784 + ... + 218976.

Almost surely, 2^42243840 is an apocalyptic number.

42243840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42243840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77324520).

42243840 is an abundant number, since it is smaller than the sum of its proper divisors (112405200).

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

42243840 is a wasteful number, since it uses less digits than its factorization.

42243840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 42243840 is about 6499.5261365733. The cubic root of 42243840 is about 348.2740607668.

The spelling of 42243840 in words is "forty-two million, two hundred forty-three thousand, eight hundred forty".