42523866 has 120 divisors (see below), whose sum is σ = 121166496. Its totient is φ = 11022480.

The previous prime is 42523823. The next prime is 42523879. The reversal of 42523866 is 66832524.

42523866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 42523866.

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 87075 + ... + 87561.

Almost surely, 2^42523866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42523866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60583248).

42523866 is an abundant number, since it is smaller than the sum of its proper divisors (78642630).

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

42523866 is a wasteful number, since it uses less digits than its factorization.

42523866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 510 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 42523866 is about 6521.0325869451. The cubic root of 42523866 is about 349.0419130676.

It can be divided in two parts, 4252 and 3866, that added together give a palindrome (8118).

The spelling of 42523866 in words is "forty-two million, five hundred twenty-three thousand, eight hundred sixty-six".