42497784 has 128 divisors (see below), whose sum is σ = 136972800. Its totient is φ = 12107232.

The previous prime is 42497783. The next prime is 42497797. The reversal of 42497784 is 48779424.

42497784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42497783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122299 + ... + 122645.

It is an arithmetic number, because the mean of its divisors is an integer number (1070100).

Almost surely, 2^42497784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42497784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68486400).

42497784 is an abundant number, since it is smaller than the sum of its proper divisors (94475016).

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

42497784 is an equidigital number, since it uses as much as digits as its factorization.

42497784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 359 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 42497784 is about 6519.0324435456. The cubic root of 42497784 is about 348.9705368898.

The spelling of 42497784 in words is "forty-two million, four hundred ninety-seven thousand, seven hundred eighty-four".