42439806 has 48 divisors (see below), whose sum is σ = 99939840. Its totient is φ = 12966480.

The previous prime is 42439783. The next prime is 42439823. The reversal of 42439806 is 60893424.

It is a happy number.

It is a super-2 number, since 2×42439806² = 3602274266635272, which contains 22 as substring.

It is a nialpdrome in base 9.

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, 8601 + ... + 12603.

It is an arithmetic number, because the mean of its divisors is an integer number (2082080).

Almost surely, 2^42439806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42439806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49969920).

42439806 is an abundant number, since it is smaller than the sum of its proper divisors (57500034).

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

42439806 is a wasteful number, since it uses less digits than its factorization.

42439806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061 (or 4058 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 42439806 is about 6514.5841003091. The cubic root of 42439806 is about 348.8117692263.

The spelling of 42439806 in words is "forty-two million, four hundred thirty-nine thousand, eight hundred six".