42783240 has 64 divisors (see below), whose sum is σ = 130003200. Its totient is φ = 11261952.

The previous prime is 42783217. The next prime is 42783241. The reversal of 42783240 is 4238724.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 42783198 and 42783207.

It is not an unprimeable number, because it can be changed into a prime (42783241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7224 + ... + 11736.

It is an arithmetic number, because the mean of its divisors is an integer number (2031300).

Almost surely, 2^42783240 is an apocalyptic number.

42783240 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 42783240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65001600).

42783240 is an abundant number, since it is smaller than the sum of its proper divisors (87219960).

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

42783240 is a wasteful number, since it uses less digits than its factorization.

42783240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4606 (or 4602 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 42783240 is about 6540.8898477195. The cubic root of 42783240 is about 349.7501345884.

The spelling of 42783240 in words is "forty-two million, seven hundred eighty-three thousand, two hundred forty".