42521838 has 16 divisors (see below), whose sum is σ = 87118416. Its totient is φ = 13828160.

The previous prime is 42521837. The next prime is 42521839. The reversal of 42521838 is 83812524.

42521838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (42521837) and next prime (42521839).

It is a junction number, because it is equal to n+sod(n) for n = 42521799 and 42521808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42521837) 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 7 ways as a sum of consecutive naturals, for example, 86181 + ... + 86672.

It is an arithmetic number, because the mean of its divisors is an integer number (5444901).

Almost surely, 2^42521838 is an apocalyptic number.

42521838 is an abundant number, since it is smaller than the sum of its proper divisors (44596578).

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

42521838 is a wasteful number, since it uses less digits than its factorization.

42521838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172899.

The product of its digits is 15360, while the sum is 33.

The square root of 42521838 is about 6520.8770882451. The cubic root of 42521838 is about 349.0363642757.

The spelling of 42521838 in words is "forty-two million, five hundred twenty-one thousand, eight hundred thirty-eight".